diff --git a/libcxx/docs/Status/RangesAlgorithms.csv b/libcxx/docs/Status/RangesAlgorithms.csv
--- a/libcxx/docs/Status/RangesAlgorithms.csv
+++ b/libcxx/docs/Status/RangesAlgorithms.csv
@@ -2,9 +2,9 @@
 Search,any_of,Christopher Di Bella,`D105793 <https://llvm.org/D105793>`_
 Search,all_of,Christopher Di Bella,`D105793 <https://llvm.org/D105793>`_
 Search,none_of,Christopher Di Bella,`D105793 <https://llvm.org/D105793>`_
-Search,find,Christopher Di Bella,`D105456 <https://llvm.org/D105456>`_
-Search,find_if,Christopher Di Bella,`D105792 <https://llvm.org/D105792>`_
-Search,find_if_not,Christopher Di Bella,`D105792 <https://llvm.org/D105792>`_
+Search,find,Nikolas Klauser,n/a, Complete
+Search,find_if,Nikolas Klauser,n/a, Complete
+Search,find_if_not,Nikolas Klauser,n/a, Complete
 Search,find_first_of,Not assigned,n/a,Not started
 Search,adjacent_find,Not assigned,n/a,Not started
 Search,mismatch,Not assigned,n/a,Not started
diff --git a/libcxx/include/CMakeLists.txt b/libcxx/include/CMakeLists.txt
--- a/libcxx/include/CMakeLists.txt
+++ b/libcxx/include/CMakeLists.txt
@@ -66,6 +66,9 @@
   __algorithm/pop_heap.h
   __algorithm/prev_permutation.h
   __algorithm/push_heap.h
+  __algorithm/ranges_find.h
+  __algorithm/ranges_find_if.h
+  __algorithm/ranges_find_if_not.h
   __algorithm/ranges_max_element.h
   __algorithm/ranges_min_element.h
   __algorithm/ranges_swap_ranges.h
diff --git a/libcxx/include/__algorithm/ranges_find.h b/libcxx/include/__algorithm/ranges_find.h
new file mode 100644
--- /dev/null
+++ b/libcxx/include/__algorithm/ranges_find.h
@@ -0,0 +1,62 @@
+//===----------------------------------------------------------------------===//
+//
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
+//
+//===----------------------------------------------------------------------===//
+
+#ifndef _LIBCPP___ALGORITHM_RANGES_FIND_H
+#define _LIBCPP___ALGORITHM_RANGES_FIND_H
+
+#include <__algorithm/ranges_find_if.h>
+#include <__config>
+#include <__functional/identity.h>
+#include <__functional/invoke.h>
+#include <__functional/ranges_operations.h>
+#include <__iterator/concepts.h>
+#include <__iterator/projected.h>
+#include <__ranges/access.h>
+#include <__ranges/concepts.h>
+#include <__ranges/dangling.h>
+#include <__utility/move.h>
+
+#if !defined(_LIBCPP_HAS_NO_PRAGMA_SYSTEM_HEADER)
+#  pragma GCC system_header
+#endif
+
+#if !defined(_LIBCPP_HAS_NO_CONCEPTS) && !defined(_LIBCPP_HAS_NO_INCOMPLETE_RANGES)
+
+_LIBCPP_BEGIN_NAMESPACE_STD
+
+namespace ranges {
+namespace __find {
+struct __fn {
+  template <input_iterator _Ip, sentinel_for<_Ip> _Sp, class _Tp, class _Proj = identity>
+    requires indirect_binary_predicate<ranges::equal_to, projected<_Ip, _Proj>, const _Tp*>
+  _LIBCPP_HIDE_FROM_ABI constexpr
+  _Ip operator()(_Ip __first, _Sp __last, const _Tp& __value, _Proj __proj = {}) const {
+    auto __pred = [&](const auto& __e) { return __value == __e; };
+    return __find_if::__fn::__go(std::move(__first), std::move(__last), __pred, __proj);
+  }
+
+  template <input_range _Rp, class _Tp, class _Proj = identity>
+    requires indirect_binary_predicate<ranges::equal_to, projected<iterator_t<_Rp>, _Proj>, const _Tp*>
+  _LIBCPP_HIDE_FROM_ABI constexpr
+  borrowed_iterator_t<_Rp> operator()(_Rp&& __r, const _Tp& __value, _Proj __proj = {}) const {
+    auto __pred = [&](const auto& __e) { return __value == __e; };
+    return __find_if::__fn::__go(ranges::begin(__r), ranges::end(__r), __pred, __proj);
+  }
+};
+} // namespace __find
+
+inline namespace __cpo {
+  inline constexpr auto find = __find::__fn{};
+} // namespace __cpo
+} // namespace ranges
+
+_LIBCPP_END_NAMESPACE_STD
+
+#endif // !defined(_LIBCPP_HAS_NO_CONCEPTS) && !defined(_LIBCPP_HAS_NO_INCOMPLETE_RANGES)
+
+#endif // _LIBCPP___ALGORITHM_RANGES_FIND_H
diff --git a/libcxx/include/__algorithm/ranges_find_if.h b/libcxx/include/__algorithm/ranges_find_if.h
new file mode 100644
--- /dev/null
+++ b/libcxx/include/__algorithm/ranges_find_if.h
@@ -0,0 +1,69 @@
+//===----------------------------------------------------------------------===//
+//
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
+//
+//===----------------------------------------------------------------------===//
+
+#ifndef _LIBCPP___ALGORITHM_RANGES_FIND_IF_H
+#define _LIBCPP___ALGORITHM_RANGES_FIND_IF_H
+
+#include <__config>
+#include <__functional/identity.h>
+#include <__functional/invoke.h>
+#include <__functional/ranges_operations.h>
+#include <__iterator/concepts.h>
+#include <__iterator/projected.h>
+#include <__ranges/access.h>
+#include <__ranges/concepts.h>
+#include <__ranges/dangling.h>
+#include <__utility/move.h>
+
+#if !defined(_LIBCPP_HAS_NO_PRAGMA_SYSTEM_HEADER)
+#  pragma GCC system_header
+#endif
+
+#if !defined(_LIBCPP_HAS_NO_CONCEPTS) && !defined(_LIBCPP_HAS_NO_INCOMPLETE_RANGES)
+
+_LIBCPP_BEGIN_NAMESPACE_STD
+
+namespace ranges {
+namespace __find_if {
+struct __fn {
+  template <class _Ip, class _Sp, class _Pred, class _Proj>
+  _LIBCPP_HIDE_FROM_ABI static constexpr
+  _Ip __go(_Ip __first, _Sp __last, _Pred& __pred, _Proj& __proj) {
+    for (; __first != __last; ++__first) {
+      if (std::invoke(__pred, std::invoke(__proj, *__first)))
+        break;
+    }
+    return __first;
+  }
+
+  template <input_iterator _Ip, sentinel_for<_Ip> _Sp, class _Proj = identity,
+            indirect_unary_predicate<projected<_Ip, _Proj>> _Pred>
+  _LIBCPP_HIDE_FROM_ABI constexpr
+  _Ip operator()(_Ip __first, _Sp __last, _Pred __pred, _Proj __proj = {}) const {
+    return __go(std::move(__first), std::move(__last), __pred, __proj);
+  }
+
+  template <input_range _Rp, class _Proj = identity,
+            indirect_unary_predicate<projected<iterator_t<_Rp>, _Proj>> _Pred>
+  _LIBCPP_HIDE_FROM_ABI constexpr
+  borrowed_iterator_t<_Rp> operator()(_Rp&& __r, _Pred __pred, _Proj __proj = {}) const {
+    return __go(ranges::begin(__r), ranges::end(__r), __pred, __proj);
+  }
+};
+} // namespace __find_if
+
+inline namespace __cpo {
+  inline constexpr auto find_if = __find_if::__fn{};
+} // namespace __cpo
+} // namespace ranges
+
+_LIBCPP_END_NAMESPACE_STD
+
+#endif // !defined(_LIBCPP_HAS_NO_CONCEPTS) && !defined(_LIBCPP_HAS_NO_INCOMPLETE_RANGES)
+
+#endif // _LIBCPP___ALGORITHM_RANGES_FIND_IF_H
diff --git a/libcxx/include/__algorithm/ranges_find_if_not.h b/libcxx/include/__algorithm/ranges_find_if_not.h
new file mode 100644
--- /dev/null
+++ b/libcxx/include/__algorithm/ranges_find_if_not.h
@@ -0,0 +1,63 @@
+//===----------------------------------------------------------------------===//
+//
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
+//
+//===----------------------------------------------------------------------===//
+
+#ifndef _LIBCPP___ALGORITHM_RANGES_FIND_IF_NOT_H
+#define _LIBCPP___ALGORITHM_RANGES_FIND_IF_NOT_H
+
+#include <__algorithm/ranges_find_if.h>
+#include <__config>
+#include <__functional/identity.h>
+#include <__functional/invoke.h>
+#include <__functional/ranges_operations.h>
+#include <__iterator/concepts.h>
+#include <__iterator/projected.h>
+#include <__ranges/access.h>
+#include <__ranges/concepts.h>
+#include <__ranges/dangling.h>
+#include <__utility/forward.h>
+#include <__utility/move.h>
+
+#if !defined(_LIBCPP_HAS_NO_PRAGMA_SYSTEM_HEADER)
+#  pragma GCC system_header
+#endif
+
+#if !defined(_LIBCPP_HAS_NO_CONCEPTS) && !defined(_LIBCPP_HAS_NO_INCOMPLETE_RANGES)
+
+_LIBCPP_BEGIN_NAMESPACE_STD
+
+namespace ranges {
+namespace __find_if_not {
+struct __fn {
+  template <input_iterator _Ip, sentinel_for<_Ip> _Sp, class _Proj = identity,
+            indirect_unary_predicate<projected<_Ip, _Proj>> _Pred>
+  _LIBCPP_HIDE_FROM_ABI constexpr
+  _Ip operator()(_Ip __first, _Sp __last, _Pred __pred, _Proj __proj = {}) const {
+    auto __pred2 = [&](auto&& __e) { return !std::invoke(__pred, std::forward<decltype(__e)>(__e)); };
+    return __find_if::__fn::__go(std::move(__first), std::move(__last), __pred2, __proj);
+  }
+
+  template <input_range _Rp, class _Proj = identity,
+            indirect_unary_predicate<projected<iterator_t<_Rp>, _Proj>> _Pred>
+  _LIBCPP_HIDE_FROM_ABI constexpr
+  borrowed_iterator_t<_Rp> operator()(_Rp&& __r, _Pred __pred, _Proj __proj = {}) const {
+    auto __pred2 = [&](auto&& __e) { return !std::invoke(__pred, std::forward<decltype(__e)>(__e)); };
+    return __find_if::__fn::__go(ranges::begin(__r), ranges::end(__r), __pred2, __proj);
+  }
+};
+} // namespace __find_if_not
+
+inline namespace __cpo {
+  inline constexpr auto find_if_not = __find_if_not::__fn{};
+} // namespace __cpo
+} // namespace ranges
+
+_LIBCPP_END_NAMESPACE_STD
+
+#endif // !defined(_LIBCPP_HAS_NO_CONCEPTS) && !defined(_LIBCPP_HAS_NO_INCOMPLETE_RANGES)
+
+#endif // _LIBCPP___ALGORITHM_RANGES_FIND_IF_NOT_H
diff --git a/libcxx/include/algorithm b/libcxx/include/algorithm
--- a/libcxx/include/algorithm
+++ b/libcxx/include/algorithm
@@ -44,6 +44,31 @@
   template<forward_range R, class Proj = identity,
     indirect_strict_weak_order<projected<iterator_t<R>, Proj>> Comp = ranges::less> // since C++20
   constexpr borrowed_iterator_t<R> min_element(R&& r, Comp comp = {}, Proj proj = {});
+
+  template<input_iterator I, sentinel_for<I> S, class T, class Proj = identity>
+    requires indirect_binary_predicate<ranges::equal_to, projected<I, Proj>, const T*>
+    constexpr I find(I first, S last, const T& value, Proj proj = {});              // since C++20
+  template<input_range R, class T, class Proj = identity>
+    requires indirect_binary_predicate<ranges::equal_to, projected<iterator_t<R>, Proj>, const T*>
+    constexpr borrowed_iterator_t<R>
+      find(R&& r, const T& value, Proj proj = {});                                  // since C++20
+
+  template<input_iterator I, sentinel_for<I> S, class Proj = identity,
+           indirect_unary_predicate<projected<I, Proj>> Pred>
+    constexpr I find_if(I first, S last, Pred pred, Proj proj = {});                // since C++20
+  template<input_range R, class Proj = identity,
+           indirect_unary_predicate<projected<iterator_t<R>, Proj>> Pred>
+    constexpr borrowed_iterator_t<R>
+      find_if(R&& r, Pred pred, Proj proj = {});                                    // since C++20
+
+  template<input_iterator I, sentinel_for<I> S, class Proj = identity,
+           indirect_unary_predicate<projected<I, Proj>> Pred>
+    constexpr I find_if_not(I first, S last, Pred pred, Proj proj = {});            // since C++20
+
+  template<input_range R, class Proj = identity,
+           indirect_unary_predicate<projected<iterator_t<R>, Proj>> Pred>
+    constexpr borrowed_iterator_t<R>
+      find_if_not(R&& r, Pred pred, Proj proj = {});                                // since C++20
 }
 
 template <class InputIterator, class Predicate>
@@ -763,6 +788,9 @@
 #include <__algorithm/pop_heap.h>
 #include <__algorithm/prev_permutation.h>
 #include <__algorithm/push_heap.h>
+#include <__algorithm/ranges_find.h>
+#include <__algorithm/ranges_find_if.h>
+#include <__algorithm/ranges_find_if_not.h>
 #include <__algorithm/ranges_max_element.h>
 #include <__algorithm/ranges_min_element.h>
 #include <__algorithm/ranges_swap_ranges.h>
diff --git a/libcxx/include/module.modulemap b/libcxx/include/module.modulemap
--- a/libcxx/include/module.modulemap
+++ b/libcxx/include/module.modulemap
@@ -294,6 +294,9 @@
       module pop_heap                 { private header "__algorithm/pop_heap.h" }
       module prev_permutation         { private header "__algorithm/prev_permutation.h" }
       module push_heap                { private header "__algorithm/push_heap.h" }
+      module ranges_find              { private header "__algorithm/ranges_find.h" }
+      module ranges_find_if           { private header "__algorithm/ranges_find_if.h" }
+      module ranges_find_if_not       { private header "__algorithm/ranges_find_if_not.h" }
       module ranges_max_element       { private header "__algorithm/ranges_max_element.h" }
       module ranges_min_element       { private header "__algorithm/ranges_min_element.h" }
       module ranges_swap_ranges       { private header "__algorithm/ranges_swap_ranges.h" }
diff --git a/libcxx/test/libcxx/diagnostics/detail.headers/algorithm/ranges_find.module.verify.cpp b/libcxx/test/libcxx/diagnostics/detail.headers/algorithm/ranges_find.module.verify.cpp
new file mode 100644
--- /dev/null
+++ b/libcxx/test/libcxx/diagnostics/detail.headers/algorithm/ranges_find.module.verify.cpp
@@ -0,0 +1,15 @@
+//===----------------------------------------------------------------------===//
+//
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
+//
+//===----------------------------------------------------------------------===//
+
+// REQUIRES: modules-build
+
+// WARNING: This test was generated by 'generate_private_header_tests.py'
+// and should not be edited manually.
+
+// expected-error@*:* {{use of private header from outside its module: '__algorithm/ranges_find.h'}}
+#include <__algorithm/ranges_find.h>
diff --git a/libcxx/test/libcxx/diagnostics/detail.headers/algorithm/ranges_find_if.module.verify.cpp b/libcxx/test/libcxx/diagnostics/detail.headers/algorithm/ranges_find_if.module.verify.cpp
new file mode 100644
--- /dev/null
+++ b/libcxx/test/libcxx/diagnostics/detail.headers/algorithm/ranges_find_if.module.verify.cpp
@@ -0,0 +1,15 @@
+//===----------------------------------------------------------------------===//
+//
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
+//
+//===----------------------------------------------------------------------===//
+
+// REQUIRES: modules-build
+
+// WARNING: This test was generated by 'generate_private_header_tests.py'
+// and should not be edited manually.
+
+// expected-error@*:* {{use of private header from outside its module: '__algorithm/ranges_find_if.h'}}
+#include <__algorithm/ranges_find_if.h>
diff --git a/libcxx/test/libcxx/diagnostics/detail.headers/algorithm/ranges_find_if_not.module.verify.cpp b/libcxx/test/libcxx/diagnostics/detail.headers/algorithm/ranges_find_if_not.module.verify.cpp
new file mode 100644
--- /dev/null
+++ b/libcxx/test/libcxx/diagnostics/detail.headers/algorithm/ranges_find_if_not.module.verify.cpp
@@ -0,0 +1,15 @@
+//===----------------------------------------------------------------------===//
+//
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
+//
+//===----------------------------------------------------------------------===//
+
+// REQUIRES: modules-build
+
+// WARNING: This test was generated by 'generate_private_header_tests.py'
+// and should not be edited manually.
+
+// expected-error@*:* {{use of private header from outside its module: '__algorithm/ranges_find_if_not.h'}}
+#include <__algorithm/ranges_find_if_not.h>
diff --git a/libcxx/test/std/algorithms/alg.nonmodifying/alg.find/ranges.find.pass.cpp b/libcxx/test/std/algorithms/alg.nonmodifying/alg.find/ranges.find.pass.cpp
new file mode 100644
--- /dev/null
+++ b/libcxx/test/std/algorithms/alg.nonmodifying/alg.find/ranges.find.pass.cpp
@@ -0,0 +1,112 @@
+//===----------------------------------------------------------------------===//
+//
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
+//
+//===----------------------------------------------------------------------===//
+
+// <algorithm>
+
+// UNSUPPORTED: c++03, c++11, c++14, c++17
+// UNSUPPORTED: libcpp-no-concepts
+// UNSUPPORTED: libcpp-has-no-incomplete-ranges
+
+// template<input_iterator I, sentinel_for<I> S, class T, class Proj = identity>
+//   requires indirect_binary_predicate<ranges::equal_to, projected<I, Proj>, const T*>
+//   constexpr I ranges::find(I first, S last, const T& value, Proj proj = {});
+// template<input_range R, class T, class Proj = identity>
+//   requires indirect_binary_predicate<ranges::equal_to, projected<iterator_t<R>, Proj>, const T*>
+//   constexpr borrowed_iterator_t<R>
+//     ranges::find(R&& r, const T& value, Proj proj = {});
+
+#include <algorithm>
+#include <array>
+#include <cassert>
+#include <ranges>
+
+#include "test_iterators.h"
+
+template <class It, class Sent = It>
+constexpr void test_iterators() {
+  {
+    int a[] = {1, 2, 3, 4};
+    std::same_as<It> auto ret = std::ranges::find(It(a), Sent(It(a + 4)), 4);
+    assert(base(ret) == a + 3);
+    assert(*ret == 4);
+  }
+  {
+    int a[] = {1, 2, 3, 4};
+    auto range = std::ranges::subrange(It(a), Sent(It(a + 4)));
+    std::same_as<It> auto ret = std::ranges::find(range, 4);
+    assert(base(ret) == a + 3);
+    assert(*ret == 4);
+  }
+}
+
+constexpr bool test() {
+  test_iterators<cpp20_input_iterator<int*>, sentinel_wrapper<cpp20_input_iterator<int*>>>();
+  test_iterators<forward_iterator<int*>>();
+  test_iterators<random_access_iterator<int*>>();
+  test_iterators<contiguous_iterator<int*>>();
+
+  { // check that projections are used properly
+    {
+      int a[] = {1, 2, 3, 4};
+      auto ret = std::ranges::find(a, a + 4, a + 3, [](int& i){ return &i; });
+      assert(ret == a + 3);
+    }
+    {
+      int a[] = {1, 2, 3, 4};
+      auto ret = std::ranges::find(a, a + 4, a + 3, [](int& i){ return &i; });
+      assert(ret == a + 3);
+    }
+  }
+
+  { // check that ranges::dangling is returned
+    [[maybe_unused]] std::same_as<std::ranges::dangling> auto ret =
+      std::ranges::find(std::array {1, 2}, 3);
+  }
+
+  { // check that an iterator is returned with a borrowing range
+    int a[] = {1, 2, 3, 4};
+    std::same_as<int*> auto ret = std::ranges::find(std::views::all(a), 1);
+    assert(ret == a);
+    assert(*ret == 1);
+  }
+
+  { // check that std::invoke is used
+    struct S { int i; };
+    S a[] = { S{1}, S{3}, S{2} };
+    std::same_as<S*> auto ret = std::ranges::find(a, 4, &S::i);
+    assert(ret == a + 3);
+  }
+
+  { // count predicate invocation count
+    {
+      int a[] = {1, 2, 3, 4};
+      int projection_count = 0;
+      auto ret = std::ranges::find(a, a + 4, 2, [&](int i) { ++projection_count; return i; });
+      assert(ret == a + 1);
+      assert(*ret == 2);
+      assert(projection_count == 2);
+    }
+    {
+      int a[] = {1, 2, 3, 4};
+      int projection_count = 0;
+      auto ret = std::ranges::find(a, 2, [&](int i) { ++projection_count; return i; });
+      assert(ret == a + 1);
+      assert(*ret == 2);
+      assert(projection_count == 2);
+    }
+  }
+
+  return true;
+}
+
+int main(int, char**) {
+  test();
+  static_assert(test());
+
+  return 0;
+}
diff --git a/libcxx/test/std/algorithms/alg.nonmodifying/alg.find/ranges.find_if.pass.cpp b/libcxx/test/std/algorithms/alg.nonmodifying/alg.find/ranges.find_if.pass.cpp
new file mode 100644
--- /dev/null
+++ b/libcxx/test/std/algorithms/alg.nonmodifying/alg.find/ranges.find_if.pass.cpp
@@ -0,0 +1,120 @@
+//===----------------------------------------------------------------------===//
+//
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
+//
+//===----------------------------------------------------------------------===//
+
+// <algorithm>
+
+// UNSUPPORTED: c++03, c++11, c++14, c++17
+// UNSUPPORTED: libcpp-no-concepts
+// UNSUPPORTED: libcpp-has-no-incomplete-ranges
+
+// template<input_iterator I, sentinel_for<I> S, class Proj = identity,
+//          indirect_unary_predicate<projected<I, Proj>> Pred>
+//   constexpr I ranges::find_if(I first, S last, Pred pred, Proj proj = {});
+// template<input_range R, class Proj = identity,
+//          indirect_unary_predicate<projected<iterator_t<R>, Proj>> Pred>
+//   constexpr borrowed_iterator_t<R>
+//     ranges::find_if(R&& r, Pred pred, Proj proj = {});
+
+#include <algorithm>
+#include <array>
+#include <cassert>
+#include <ranges>
+
+#include "test_iterators.h"
+
+template <class It, class Sent = It>
+constexpr void test_iterators() {
+  {
+    int a[] = {1, 2, 3, 4};
+    std::same_as<It> auto ret = std::ranges::find_if(It(a), Sent(It(a + 4)), [c = 0](int) mutable { return c++ > 2; });
+    assert(base(ret) == a + 3);
+    assert(*ret == 4);
+  }
+  {
+    int a[] = {1, 2, 3, 4};
+    auto range = std::ranges::subrange(It(a), Sent(It(a + 4)));
+    std::same_as<It> auto ret = std::ranges::find_if(range, [c = 0](int) mutable { return c++ > 2; });
+    assert(base(ret) == a + 3);
+    assert(*ret == 4);
+  }
+}
+
+constexpr bool test() {
+  test_iterators<cpp20_input_iterator<int*>, sentinel_wrapper<cpp20_input_iterator<int*>>>();
+  test_iterators<forward_iterator<int*>>();
+  test_iterators<random_access_iterator<int*>>();
+  test_iterators<contiguous_iterator<int*>>();
+
+  { // check that projections are used properly
+    {
+      int a[] = {1, 2, 3, 4};
+      auto ret = std::ranges::find_if(a, a + 4, [&](int* p) { return p == a + 3; }, [](int& i){ return &i; });
+      assert(ret == a + 3);
+    }
+    {
+      int a[] = {1, 2, 3, 4};
+      auto ret = std::ranges::find_if(a, [&](int* p) { return p == a + 3; }, [](int& i){ return &i; });
+      assert(ret == a + 3);
+    }
+  }
+
+  { // check that ranges::dangling is returned
+    [[maybe_unused]] std::same_as<std::ranges::dangling> auto ret =
+      std::ranges::find_if(std::array {1, 2}, [](int){ return false; });
+  }
+
+  { // check that an iterator is returned with a borrowing range
+    int a[] = {1, 2, 3, 4};
+    std::same_as<int*> auto ret = std::ranges::find_if(std::views::all(a), [](int){ return true; });
+    assert(ret == a);
+    assert(*ret == 1);
+  }
+
+  { // check that std::invoke is used
+    struct S { int i; };
+    S a[] = { S{1}, S{3}, S{2} };
+    std::same_as<S*> auto ret = std::ranges::find_if(a, [](int) { return false; }, &S::i);
+    assert(ret == a + 3);
+  }
+
+  { // count projection and predicate invocation count
+    {
+      int a[] = {1, 2, 3, 4};
+      int predicate_count = 0;
+      int projection_count = 0;
+      auto ret = std::ranges::find_if(a, a + 4,
+                                      [&](int i) { ++predicate_count; return i == 2; },
+                                      [&](int i) { ++projection_count; return i; });
+      assert(ret == a + 1);
+      assert(*ret == 2);
+      assert(predicate_count == 2);
+      assert(projection_count == 2);
+    }
+    {
+      int a[] = {1, 2, 3, 4};
+      int predicate_count = 0;
+      int projection_count = 0;
+      auto ret = std::ranges::find_if(a,
+                                      [&](int i) { ++predicate_count; return i == 2; },
+                                      [&](int i) { ++projection_count; return i; });
+      assert(ret == a + 1);
+      assert(*ret == 2);
+      assert(predicate_count == 2);
+      assert(projection_count == 2);
+    }
+  }
+
+  return true;
+}
+
+int main(int, char**) {
+  test();
+  static_assert(test());
+
+  return 0;
+}
diff --git a/libcxx/test/std/algorithms/alg.nonmodifying/alg.find/ranges.find_if_not.pass.cpp b/libcxx/test/std/algorithms/alg.nonmodifying/alg.find/ranges.find_if_not.pass.cpp
new file mode 100644
--- /dev/null
+++ b/libcxx/test/std/algorithms/alg.nonmodifying/alg.find/ranges.find_if_not.pass.cpp
@@ -0,0 +1,120 @@
+//===----------------------------------------------------------------------===//
+//
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
+//
+//===----------------------------------------------------------------------===//
+
+// <algorithm>
+
+// UNSUPPORTED: c++03, c++11, c++14, c++17
+// UNSUPPORTED: libcpp-no-concepts
+// UNSUPPORTED: libcpp-has-no-incomplete-ranges
+
+// template<input_iterator I, sentinel_for<I> S, class Proj = identity,
+//          indirect_unary_predicate<projected<I, Proj>> Pred>
+//   constexpr I ranges::find_if_not(I first, S last, Pred pred, Proj proj = {});
+// template<input_range R, class Proj = identity,
+//          indirect_unary_predicate<projected<iterator_t<R>, Proj>> Pred>
+//   constexpr borrowed_iterator_t<R>
+//     ranges::find_if_not(R&& r, Pred pred, Proj proj = {});
+
+#include <algorithm>
+#include <array>
+#include <cassert>
+#include <ranges>
+
+#include "test_iterators.h"
+
+template <class It, class Sent = It>
+constexpr void test_iterators() {
+  {
+    int a[] = {1, 2, 3, 4};
+    std::same_as<It> auto ret = std::ranges::find_if_not(It(a), Sent(It(a + 4)), [c = 0](int) mutable { return c++ <= 2; });
+    assert(base(ret) == a + 3);
+    assert(*ret == 4);
+  }
+  {
+    int a[] = {1, 2, 3, 4};
+    auto range = std::ranges::subrange(It(a), Sent(It(a + 4)));
+    std::same_as<It> auto ret = std::ranges::find_if_not(range, [c = 0](int) mutable { return c++ <= 2; });
+    assert(base(ret) == a + 3);
+    assert(*ret == 4);
+  }
+}
+
+constexpr bool test() {
+  test_iterators<cpp20_input_iterator<int*>, sentinel_wrapper<cpp20_input_iterator<int*>>>();
+  test_iterators<forward_iterator<int*>>();
+  test_iterators<random_access_iterator<int*>>();
+  test_iterators<contiguous_iterator<int*>>();
+
+  { // check that projections are used properly
+    {
+      int a[] = {1, 2, 3, 4};
+      auto ret = std::ranges::find_if_not(a, a + 4, [&](int* p) { return p != a + 3; }, [](int& i){ return &i; });
+      assert(ret == a + 3);
+    }
+    {
+      int a[] = {1, 2, 3, 4};
+      auto ret = std::ranges::find_if_not(a, [&](int* p) { return p != a + 3; }, [](int& i){ return &i; });
+      assert(ret == a + 3);
+    }
+  }
+
+  { // check that ranges::dangling is returned
+    [[maybe_unused]] std::same_as<std::ranges::dangling> auto ret =
+      std::ranges::find_if_not(std::array {1, 2}, [](int){ return true; });
+  }
+
+  { // check that an iterator is returned with a borrowing range
+    int a[] = {1, 2, 3, 4};
+    std::same_as<int*> auto ret = std::ranges::find_if_not(std::views::all(a), [](int){ return false; });
+    assert(ret == a);
+    assert(*ret == 1);
+  }
+
+  { // check that std::invoke is used
+    struct S { int i; };
+    S a[] = { S{1}, S{3}, S{2} };
+    std::same_as<S*> auto ret = std::ranges::find_if_not(a, [](int) { return true; }, &S::i);
+    assert(ret == a + 3);
+  }
+
+  { // count projection and predicate invocation count
+    {
+      int a[] = {1, 2, 3, 4};
+      int predicate_count = 0;
+      int projection_count = 0;
+      auto ret = std::ranges::find_if_not(a, a + 4,
+                                      [&](int i) { ++predicate_count; return i != 2; },
+                                      [&](int i) { ++projection_count; return i; });
+      assert(ret == a + 1);
+      assert(*ret == 2);
+      assert(predicate_count == 2);
+      assert(projection_count == 2);
+    }
+    {
+      int a[] = {1, 2, 3, 4};
+      int predicate_count = 0;
+      int projection_count = 0;
+      auto ret = std::ranges::find_if_not(a,
+                                      [&](int i) { ++predicate_count; return i != 2; },
+                                      [&](int i) { ++projection_count; return i; });
+      assert(ret == a + 1);
+      assert(*ret == 2);
+      assert(predicate_count == 2);
+      assert(projection_count == 2);
+    }
+  }
+
+  return true;
+}
+
+int main(int, char**) {
+  test();
+  static_assert(test());
+
+  return 0;
+}