diff --git a/libcxx/include/CMakeLists.txt b/libcxx/include/CMakeLists.txt
--- a/libcxx/include/CMakeLists.txt
+++ b/libcxx/include/CMakeLists.txt
@@ -102,6 +102,8 @@
   __algorithm/ranges_move.h
   __algorithm/ranges_move_backward.h
   __algorithm/ranges_none_of.h
+  __algorithm/ranges_remove.h
+  __algorithm/ranges_remove_if.h
   __algorithm/ranges_replace.h
   __algorithm/ranges_replace_if.h
   __algorithm/ranges_reverse.h
diff --git a/libcxx/include/__algorithm/ranges_remove.h b/libcxx/include/__algorithm/ranges_remove.h
new file mode 100644
--- /dev/null
+++ b/libcxx/include/__algorithm/ranges_remove.h
@@ -0,0 +1,60 @@
+//===----------------------------------------------------------------------===//
+//
+// 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_REMOVE_H
+#define _LIBCPP___ALGORITHM_RANGES_REMOVE_H
+
+#include <__algorithm/ranges_remove_if.h>
+#include <__config>
+#include <__functional/identity.h>
+#include <__functional/ranges_operations.h>
+#include <__iterator/permutable.h>
+#include <__iterator/projected.h>
+#include <__ranges/subrange.h>
+
+#if !defined(_LIBCPP_HAS_NO_PRAGMA_SYSTEM_HEADER)
+#  pragma GCC system_header
+#endif
+
+#if _LIBCPP_STD_VER > 17 && !defined(_LIBCPP_HAS_NO_INCOMPLETE_RANGES)
+
+_LIBCPP_BEGIN_NAMESPACE_STD
+
+namespace ranges {
+namespace __remove {
+struct __fn {
+
+  template <permutable _Iter, sentinel_for<_Iter> _Sent, class _Type, class _Proj = identity>
+    requires indirect_binary_predicate<ranges::equal_to, projected<_Iter, _Proj>, const _Type*>
+  _LIBCPP_HIDE_FROM_ABI constexpr
+  subrange<_Iter> operator()(_Iter __first, _Sent __last, const _Type& __value, _Proj __proj = {}) const {
+    auto __pred = [&](auto&& __other) { return __value == __other; };
+    return ranges::__remove_if_impl(__first, __last, __pred, __proj);
+  }
+
+  template <forward_range _Range, class _Type, class _Proj = identity>
+    requires permutable<iterator_t<_Range>>
+          && indirect_binary_predicate<ranges::equal_to, projected<iterator_t<_Range>, _Proj>, const _Type*>
+  _LIBCPP_HIDE_FROM_ABI constexpr
+  borrowed_subrange_t<_Range> operator()(_Range&& __range, const _Type& __value, _Proj __proj = {}) const {
+    auto __pred = [&](auto&& __other) { return __value == __other; };
+    return ranges::__remove_if_impl(ranges::begin(__range), ranges::end(__range), __pred, __proj);
+  }
+};
+} // namespace __remove
+
+inline namespace __cpo {
+  inline constexpr auto remove = __remove::__fn{};
+} // namespace __cpo
+} // namespace ranges
+
+_LIBCPP_END_NAMESPACE_STD
+
+#endif // _LIBCPP_STD_VER > 17 && !defined(_LIBCPP_HAS_NO_INCOMPLETE_RANGES)
+
+#endif // _LIBCPP___ALGORITHM_RANGES_REMOVE_H
diff --git a/libcxx/include/__algorithm/ranges_remove_if.h b/libcxx/include/__algorithm/ranges_remove_if.h
new file mode 100644
--- /dev/null
+++ b/libcxx/include/__algorithm/ranges_remove_if.h
@@ -0,0 +1,83 @@
+//===----------------------------------------------------------------------===//
+//
+// 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_REMOVE_IF_H
+#define _LIBCPP___ALGORITHM_RANGES_REMOVE_IF_H
+
+#include <__algorithm/ranges_find_if.h>
+#include <__config>
+#include <__functional/identity.h>
+#include <__functional/ranges_operations.h>
+#include <__iterator/concepts.h>
+#include <__iterator/iter_move.h>
+#include <__iterator/permutable.h>
+#include <__iterator/projected.h>
+#include <__ranges/access.h>
+#include <__ranges/concepts.h>
+#include <__ranges/subrange.h>
+
+#if !defined(_LIBCPP_HAS_NO_PRAGMA_SYSTEM_HEADER)
+#  pragma GCC system_header
+#endif
+
+#if _LIBCPP_STD_VER > 17 && !defined(_LIBCPP_HAS_NO_INCOMPLETE_RANGES)
+
+_LIBCPP_BEGIN_NAMESPACE_STD
+
+namespace ranges {
+
+template <class _Iter, class _Sent, class _Proj, class _Pred>
+_LIBCPP_HIDE_FROM_ABI constexpr
+subrange<_Iter> __remove_if_impl(_Iter __first, _Sent __last, _Pred& __pred, _Proj& __proj) {
+  auto __end = ranges::__find_if_impl(__first, __last, __pred, __proj);
+  if (__end == __last)
+    return {__end, __end};
+
+  _Iter __i = __end;
+  while (++__i != __last) {
+    if (!std::invoke(__pred, std::invoke(__proj, *__i))) {
+      *__end = ranges::iter_move(__i);
+      ++__end;
+    }
+  }
+  return {__end, __i};
+}
+
+namespace __remove_if {
+struct __fn {
+
+  template <permutable _Iter, sentinel_for<_Iter> _Sent,
+            class _Proj = identity,
+            indirect_unary_predicate<projected<_Iter, _Proj>> _Pred>
+  _LIBCPP_HIDE_FROM_ABI constexpr
+  subrange<_Iter> operator()(_Iter __first, _Sent __last, _Pred __pred, _Proj __proj = {}) const {
+    return ranges::__remove_if_impl(std::move(__first), std::move(__last), __pred, __proj);
+  }
+
+  template <forward_range _Range,
+            class _Proj = identity,
+            indirect_unary_predicate<projected<iterator_t<_Range>, _Proj>> _Pred>
+    requires permutable<iterator_t<_Range>>
+  _LIBCPP_HIDE_FROM_ABI constexpr
+  borrowed_subrange_t<_Range> operator()(_Range&& __range, _Pred __pred, _Proj __proj = {}) const {
+    return ranges::__remove_if_impl(ranges::begin(__range), ranges::end(__range), __pred, __proj);
+  }
+
+};
+} // namespace __remove_if
+
+inline namespace __cpo {
+  inline constexpr auto remove_if = __remove_if::__fn{};
+} // namespace __cpo
+} // namespace ranges
+
+_LIBCPP_END_NAMESPACE_STD
+
+#endif // _LIBCPP_STD_VER > 17 && !defined(_LIBCPP_HAS_NO_INCOMPLETE_RANGES)
+
+#endif // _LIBCPP___ALGORITHM_RANGES_REMOVE_IF_H
diff --git a/libcxx/include/algorithm b/libcxx/include/algorithm
--- a/libcxx/include/algorithm
+++ b/libcxx/include/algorithm
@@ -1219,6 +1219,8 @@
 #include <__algorithm/ranges_move.h>
 #include <__algorithm/ranges_move_backward.h>
 #include <__algorithm/ranges_none_of.h>
+#include <__algorithm/ranges_remove.h>
+#include <__algorithm/ranges_remove_if.h>
 #include <__algorithm/ranges_replace.h>
 #include <__algorithm/ranges_replace_if.h>
 #include <__algorithm/ranges_reverse.h>
diff --git a/libcxx/test/libcxx/algorithms/ranges_robust_against_copying_comparators.pass.cpp b/libcxx/test/libcxx/algorithms/ranges_robust_against_copying_comparators.pass.cpp
--- a/libcxx/test/libcxx/algorithms/ranges_robust_against_copying_comparators.pass.cpp
+++ b/libcxx/test/libcxx/algorithms/ranges_robust_against_copying_comparators.pass.cpp
@@ -189,8 +189,8 @@
     //(void)std::ranges::push_heap(a, Less(&copies)); assert(copies == 0);
     //(void)std::ranges::remove_copy_if(first, last, first2, UnaryTrue(&copies)); assert(copies == 0);
     //(void)std::ranges::remove_copy_if(a, first2, UnaryTrue(&copies)); assert(copies == 0);
-    //(void)std::ranges::remove_if(first, last, UnaryTrue(&copies)); assert(copies == 0);
-    //(void)std::ranges::remove_if(a, UnaryTrue(&copies)); assert(copies == 0);
+    (void)std::ranges::remove_if(first, last, UnaryTrue(&copies)); assert(copies == 0);
+    (void)std::ranges::remove_if(a, UnaryTrue(&copies)); assert(copies == 0);
     //(void)std::ranges::replace_copy_if(first, last, first2, UnaryTrue(&copies), value); assert(copies == 0);
     //(void)std::ranges::replace_copy_if(a, first2, UnaryTrue(&copies), value); assert(copies == 0);
     (void)std::ranges::replace_if(first, last, UnaryTrue(&copies), value); assert(copies == 0);
diff --git a/libcxx/test/libcxx/algorithms/ranges_robust_against_copying_projections.pass.cpp b/libcxx/test/libcxx/algorithms/ranges_robust_against_copying_projections.pass.cpp
--- a/libcxx/test/libcxx/algorithms/ranges_robust_against_copying_projections.pass.cpp
+++ b/libcxx/test/libcxx/algorithms/ranges_robust_against_copying_projections.pass.cpp
@@ -174,10 +174,10 @@
     //(void)std::ranges::remove_copy(a, first2, value, Proj(&copies)); assert(copies == 0);
     //(void)std::ranges::remove_copy_if(first, last, first2, UnaryTrue(), Proj(&copies)); assert(copies == 0);
     //(void)std::ranges::remove_copy_if(a, first2, UnaryTrue(), Proj(&copies)); assert(copies == 0);
-    //(void)std::ranges::remove(first, last, value, Proj(&copies)); assert(copies == 0);
-    //(void)std::ranges::remove(a, value, Proj(&copies)); assert(copies == 0);
-    //(void)std::ranges::remove_if(first, last, UnaryTrue(), Proj(&copies)); assert(copies == 0);
-    //(void)std::ranges::remove_if(a, UnaryTrue(), Proj(&copies)); assert(copies == 0);
+    (void)std::ranges::remove(first, last, value, Proj(&copies)); assert(copies == 0);
+    (void)std::ranges::remove(a, value, Proj(&copies)); assert(copies == 0);
+    (void)std::ranges::remove_if(first, last, UnaryTrue(), Proj(&copies)); assert(copies == 0);
+    (void)std::ranges::remove_if(a, UnaryTrue(), Proj(&copies)); assert(copies == 0);
     //(void)std::ranges::replace_copy(first, last, first2, value, T(), Proj(&copies)); assert(copies == 0);
     //(void)std::ranges::replace_copy(a, first2, value, T(), Proj(&copies)); assert(copies == 0);
     //(void)std::ranges::replace_copy_if(first, last, first2, UnaryTrue(), T(), Proj(&copies)); assert(copies == 0);
diff --git a/libcxx/test/std/algorithms/alg.modifying.operations/alg.remove/ranges.remove.pass.cpp b/libcxx/test/std/algorithms/alg.modifying.operations/alg.remove/ranges.remove.pass.cpp
new file mode 100644
--- /dev/null
+++ b/libcxx/test/std/algorithms/alg.modifying.operations/alg.remove/ranges.remove.pass.cpp
@@ -0,0 +1,206 @@
+//===----------------------------------------------------------------------===//
+//
+// 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-has-no-incomplete-ranges
+
+// template<permutable I, sentinel_for<I> S, class T, class Proj = identity>
+//   requires indirect_binary_predicate<ranges::equal_to, projected<I, Proj>, const T*>
+//   constexpr subrange<I> ranges::remove(I first, S last, const T& value, Proj proj = {});
+// template<forward_range R, class T, class Proj = identity>
+//   requires permutable<iterator_t<R>> &&
+//            indirect_binary_predicate<ranges::equal_to, projected<iterator_t<R>, Proj>, const T*>
+//   constexpr borrowed_subrange_t<R>
+//     ranges::remove(R&& r, const T& value, Proj proj = {});
+
+#include <algorithm>
+#include <array>
+#include <cassert>
+#include <ranges>
+
+#include "almost_satisfies_types.h"
+#include "boolean_testable.h"
+#include "test_iterators.h"
+
+template <class Iter, class Sent = sentinel_wrapper<Iter>>
+concept HasRemoveIt = requires(Iter first, Sent last) { std::ranges::remove(first, last, 0); };
+
+static_assert(HasRemoveIt<int*>);
+static_assert(!HasRemoveIt<PermutableNotForwardIterator>);
+static_assert(!HasRemoveIt<PermutableNotSwappable>);
+static_assert(!HasRemoveIt<int*, SentinelForNotSemiregular>);
+static_assert(!HasRemoveIt<int*, SentinelForNotWeaklyEqualityComparableWith>);
+static_assert(!HasRemoveIt<int**>); // not indirect_binary_prediacte
+
+template <class Range>
+concept HasRemoveR = requires(Range range) { std::ranges::remove(range, 0); };
+
+static_assert(HasRemoveR<UncheckedRange<int*>>);
+static_assert(!HasRemoveR<PermutableRangeNotForwardIterator>);
+static_assert(!HasRemoveR<PermutableRangeNotSwappable>);
+static_assert(!HasRemoveR<SentinelForNotSemiregular>);
+static_assert(!HasRemoveR<SentinelForNotWeaklyEqualityComparableWith>);
+static_assert(!HasRemoveR<UncheckedRange<int**>>); // not indirect_binary_prediacte
+
+template <int N, int M>
+struct Data {
+  std::array<int, N> input;
+  std::array<int, M> expected;
+  int val;
+};
+
+template <class Iter, class Sent, int N, int M>
+constexpr void test(Data<N, M> d) {
+  {
+    auto input = d.input;
+
+    std::same_as<std::ranges::subrange<Iter>> decltype(auto) ret =
+        std::ranges::remove(Iter(input.data()), Sent(Iter(input.data() + input.size())), d.val);
+
+    assert(base(ret.begin()) == input.data() + M);
+    assert(base(ret.end()) == input.data() + N);
+    assert(std::ranges::equal(input.begin(), base(ret.begin()), d.expected.begin(), d.expected.end()));
+  }
+  {
+    auto input = d.input;
+    auto range = std::ranges::subrange(Iter(input.data()), Sent(Iter(input.data() + input.size())));
+
+    std::same_as<std::ranges::subrange<Iter>> decltype(auto) ret = std::ranges::remove(range, d.val);
+
+    assert(base(ret.begin()) == input.data() + M);
+    assert(base(ret.end()) == input.data() + N);
+    assert(std::ranges::equal(base(input.begin()), base(ret.begin()), d.expected.begin(), d.expected.end()));
+  }
+}
+
+template <class Iter, class Sent>
+constexpr void tests() {
+  // simple test
+  test<Iter, Sent, 6, 5>({.input = {1, 2, 3, 4, 5, 6}, .expected = {1, 2, 3, 4, 6}, .val = 5});
+  // empty range
+  test<Iter, Sent, 0, 0>({});
+  // single element range - match
+  test<Iter, Sent, 1, 0>({.input = {1}, .expected = {}, .val = 1});
+  // single element range - no match
+  test<Iter, Sent, 1, 1>({.input = {1}, .expected = {1}, .val = 2});
+  // two element range - same order
+  test<Iter, Sent, 2, 1>({.input = {1, 2}, .expected = {1}, .val = 2});
+  // two element range - reversed order
+  test<Iter, Sent, 2, 1>({.input = {1, 2}, .expected = {2}, .val = 1});
+  // all elements match
+  test<Iter, Sent, 5, 0>({.input = {1, 1, 1, 1, 1}, .expected = {}, .val = 1});
+  // the relative order of elements isn't changed
+  test<Iter, Sent, 8, 5>({.input = {1, 2, 3, 2, 3, 4, 2, 5}, .expected = {1, 3, 3, 4, 5}, .val = 2});
+}
+
+template <class Iter>
+constexpr void test_sentinels() {
+  tests<Iter, Iter>();
+  tests<Iter, sentinel_wrapper<Iter>>();
+  tests<Iter, sized_sentinel<Iter>>();
+}
+
+constexpr void test_iterators() {
+  test_sentinels<forward_iterator<int*>>();
+  test_sentinels<bidirectional_iterator<int*>>();
+  test_sentinels<random_access_iterator<int*>>();
+  test_sentinels<contiguous_iterator<int*>>();
+  test_sentinels<int*>();
+}
+
+constexpr bool test() {
+  test_iterators();
+
+  { // check that ranges::dangling is returned
+    [[maybe_unused]] std::same_as<std::ranges::dangling> decltype(auto) ret =
+        std::ranges::remove(std::array{1, 2, 3, 4}, 1);
+  }
+
+  { // check complexity requirements
+    struct CompCounter {
+      int* comp_count;
+
+      constexpr bool operator==(const CompCounter&) const {
+        ++*comp_count;
+        return false;
+      }
+    };
+    {
+      int proj_count = 0;
+      auto proj      = [&](CompCounter i) {
+        ++proj_count;
+        return i;
+      };
+      int comp_count = 0;
+
+      CompCounter a[] = {{&comp_count}, {&comp_count}, {&comp_count}, {&comp_count}};
+      auto ret        = std::ranges::remove(std::begin(a), std::end(a), CompCounter{&comp_count}, proj);
+      assert(ret.begin() == std::end(a) && ret.end() == std::end(a));
+      assert(comp_count == 4);
+      assert(proj_count == 4);
+    }
+    {
+      int proj_count = 0;
+      auto proj      = [&](CompCounter i) {
+        ++proj_count;
+        return i;
+      };
+      int comp_count = 0;
+
+      CompCounter a[] = {{&comp_count}, {&comp_count}, {&comp_count}, {&comp_count}};
+      auto ret        = std::ranges::remove(a, CompCounter{&comp_count}, proj);
+      assert(ret.begin() == std::end(a) && ret.end() == std::end(a));
+      assert(comp_count == 4);
+      assert(proj_count == 4);
+    }
+  }
+
+  { // check that std::invoke is used
+    struct S {
+      constexpr S& identity() { return *this; }
+      bool operator==(const S&) const = default;
+    };
+    {
+      S a[4]   = {};
+      auto ret = std::ranges::remove(std::begin(a), std::end(a), S{}, &S::identity);
+      assert(ret.begin() == std::begin(a));
+      assert(ret.end() == std::end(a));
+    }
+    {
+      S a[4]   = {};
+      auto ret = std::ranges::remove(a, S{}, &S::identity);
+      assert(ret.begin() == std::begin(a));
+      assert(ret.end() == std::end(a));
+    }
+  }
+
+  {
+    // check that the implicit conversion to bool works
+    {
+      StrictComparable<int> a[] = {1, 2, 3, 4};
+      auto ret                  = std::ranges::remove(a, a + 4, StrictComparable<int>{2});
+      assert(ret.begin() == a + 3);
+    }
+    {
+      StrictComparable<int> a[] = {1, 2, 3, 4};
+      auto ret                  = std::ranges::remove(a, StrictComparable<int>{2});
+      assert(ret.begin() == a + 3);
+    }
+  }
+
+  return true;
+}
+
+int main(int, char**) {
+  test();
+  static_assert(test());
+
+  return 0;
+}
diff --git a/libcxx/test/std/algorithms/alg.modifying.operations/alg.remove/ranges.remove_if.pass.cpp b/libcxx/test/std/algorithms/alg.modifying.operations/alg.remove/ranges.remove_if.pass.cpp
new file mode 100644
--- /dev/null
+++ b/libcxx/test/std/algorithms/alg.modifying.operations/alg.remove/ranges.remove_if.pass.cpp
@@ -0,0 +1,207 @@
+//===----------------------------------------------------------------------===//
+//
+// 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-has-no-incomplete-ranges
+
+// template<permutable I, sentinel_for<I> S, class T, class Proj = identity>
+//   requires indirect_binary_predicate<ranges::equal_to, projected<I, Proj>, const T*>
+//   constexpr subrange<I> ranges::remove(I first, S last, const T& value, Proj proj = {});
+// template<forward_range R, class T, class Proj = identity>
+//   requires permutable<iterator_t<R>> &&
+//            indirect_binary_predicate<ranges::equal_to, projected<iterator_t<R>, Proj>, const T*>
+//   constexpr borrowed_subrange_t<R>
+//     ranges::remove(R&& r, const T& value, Proj proj = {});
+
+#include <algorithm>
+#include <array>
+#include <cassert>
+#include <ranges>
+
+#include "almost_satisfies_types.h"
+#include "boolean_testable.h"
+#include "test_iterators.h"
+
+struct FalsePredicate {
+  bool operator()(int) { return false; }
+};
+
+template <class Iter, class Sent = sentinel_wrapper<Iter>>
+concept HasRemoveIfIt = requires(Iter first, Sent last) { std::ranges::remove_if(first, last, FalsePredicate{}); };
+
+static_assert(HasRemoveIfIt<int*>);
+static_assert(!HasRemoveIfIt<PermutableNotForwardIterator>);
+static_assert(!HasRemoveIfIt<PermutableNotSwappable>);
+static_assert(!HasRemoveIfIt<int*, SentinelForNotSemiregular>);
+static_assert(!HasRemoveIfIt<int*, SentinelForNotWeaklyEqualityComparableWith>);
+static_assert(!HasRemoveIfIt<int**>); // not indirect_unary_predicate
+
+template <class Range>
+concept HasRemoveR = requires(Range range) { std::ranges::remove(range, 0); };
+
+static_assert(HasRemoveR<UncheckedRange<int*>>);
+static_assert(!HasRemoveR<PermutableRangeNotForwardIterator>);
+static_assert(!HasRemoveR<PermutableRangeNotSwappable>);
+static_assert(!HasRemoveR<SentinelForNotSemiregular>);
+static_assert(!HasRemoveR<SentinelForNotWeaklyEqualityComparableWith>);
+static_assert(!HasRemoveR<UncheckedRange<int**>>); // not indirect_unary_predicate
+
+template <int N, int M>
+struct Data {
+  std::array<int, N> input;
+  std::array<int, M> expected;
+  int val;
+};
+
+template <class Iter, class Sent, int N, int M>
+constexpr void test(Data<N, M> d) {
+  {
+    auto input = d.input;
+
+    std::same_as<std::ranges::subrange<Iter>> decltype(auto) ret = std::ranges::remove_if(
+        Iter(input.data()), Sent(Iter(input.data() + input.size())), [&](int i) { return i < d.val; });
+
+    assert(base(ret.begin()) == input.data() + M);
+    assert(base(ret.end()) == input.data() + N);
+    assert(std::ranges::equal(input.begin(), base(ret.begin()), d.expected.begin(), d.expected.end()));
+  }
+  {
+    auto input = d.input;
+    auto range = std::ranges::subrange(Iter(input.data()), Sent(Iter(input.data() + input.size())));
+
+    std::same_as<std::ranges::subrange<Iter>> decltype(auto) ret = std::ranges::remove_if(range, [&](int i) {
+      return i < d.val;
+    });
+
+    assert(base(ret.begin()) == input.data() + M);
+    assert(base(ret.end()) == input.data() + N);
+    assert(std::ranges::equal(base(input.begin()), base(ret.begin()), d.expected.begin(), d.expected.end()));
+  }
+}
+
+template <class Iter, class Sent>
+constexpr void tests() {
+  // simple test
+  test<Iter, Sent, 6, 2>({.input = {1, 2, 3, 4, 5, 6}, .expected = {5, 6}, .val = 5});
+  // empty range
+  test<Iter, Sent, 0, 0>({});
+  // single element range - no match
+  test<Iter, Sent, 1, 1>({.input = {1}, .expected = {1}, .val = 1});
+  // single element range - match
+  test<Iter, Sent, 1, 0>({.input = {1}, .expected = {}, .val = 2});
+  // two element range
+  test<Iter, Sent, 2, 1>({.input = {1, 2}, .expected = {2}, .val = 2});
+  // all elements matche
+  test<Iter, Sent, 5, 0>({.input = {1, 1, 1, 1, 1}, .expected = {}, .val = 2});
+  // the relative order of elements isn't changed
+  test<Iter, Sent, 8, 7>({.input = {1, 2, 3, 2, 3, 4, 2, 5}, .expected = {2, 3, 2, 3, 4, 2, 5}, .val = 2});
+}
+
+template <class Iter>
+constexpr void test_sentinels() {
+  tests<Iter, Iter>();
+  tests<Iter, sentinel_wrapper<Iter>>();
+  tests<Iter, sized_sentinel<Iter>>();
+}
+
+constexpr void test_iterators() {
+  test_sentinels<forward_iterator<int*>>();
+  test_sentinels<bidirectional_iterator<int*>>();
+  test_sentinels<random_access_iterator<int*>>();
+  test_sentinels<contiguous_iterator<int*>>();
+  test_sentinels<int*>();
+}
+
+constexpr bool test() {
+  test_iterators();
+
+  { // check that ranges::dangling is returned
+    [[maybe_unused]] std::same_as<std::ranges::dangling> decltype(auto) ret =
+        std::ranges::remove_if(std::array{1, 2, 3, 4}, [](int i) { return i < 0; });
+  }
+
+  {// check complexity requirements
+   {int comp_count = 0;
+  auto comp = [&](int i) {
+    ++comp_count;
+    return i == 0;
+  };
+  int proj_count = 0;
+  auto proj      = [&](int i) {
+    ++proj_count;
+    return i;
+  };
+  int a[]  = {1, 2, 3, 4};
+  auto ret = std::ranges::remove_if(std::begin(a), std::end(a), comp, proj);
+  assert(ret.begin() == std::end(a) && ret.end() == std::end(a));
+  assert(comp_count == 4);
+  assert(proj_count == 4);
+}
+{
+  int comp_count = 0;
+  auto comp      = [&](int i) {
+    ++comp_count;
+    return i == 0;
+  };
+  int proj_count = 0;
+  auto proj      = [&](int i) {
+    ++proj_count;
+    return i;
+  };
+  int a[]  = {1, 2, 3, 4};
+  auto ret = std::ranges::remove_if(a, comp, proj);
+  assert(ret.begin() == std::end(a) && ret.end() == std::end(a));
+  assert(comp_count == 4);
+  assert(proj_count == 4);
+}
+}
+
+{ // check that std::invoke is used
+  struct S {
+    constexpr S& identity() { return *this; }
+    constexpr bool predicate() const { return true; }
+  };
+  {
+    S a[4]   = {};
+    auto ret = std::ranges::remove_if(std::begin(a), std::end(a), &S::predicate, &S::identity);
+    assert(ret.begin() == std::begin(a));
+    assert(ret.end() == std::end(a));
+  }
+  {
+    S a[4]   = {};
+    auto ret = std::ranges::remove_if(a, &S::predicate, &S::identity);
+    assert(ret.begin() == std::begin(a));
+    assert(ret.end() == std::end(a));
+  }
+}
+
+{
+  // check that the implicit conversion to bool works
+  {
+    int a[]  = {1, 2, 3, 4};
+    auto ret = std::ranges::remove_if(a, a + 4, [](const int& i) { return BooleanTestable{i == 3}; });
+    assert(ret.begin() == a + 3);
+  }
+  {
+    int a[]  = {1, 2, 3, 4};
+    auto ret = std::ranges::remove_if(a, [](const int& b) { return BooleanTestable{b == 3}; });
+    assert(ret.begin() == a + 3);
+  }
+}
+
+return true;
+}
+
+int main(int, char**) {
+  test();
+  static_assert(test());
+
+  return 0;
+}
diff --git a/libcxx/test/std/library/description/conventions/customization.point.object/niebloid.compile.pass.cpp b/libcxx/test/std/library/description/conventions/customization.point.object/niebloid.compile.pass.cpp
--- a/libcxx/test/std/library/description/conventions/customization.point.object/niebloid.compile.pass.cpp
+++ b/libcxx/test/std/library/description/conventions/customization.point.object/niebloid.compile.pass.cpp
@@ -117,10 +117,10 @@
 //static_assert(test(std::ranges::pop_heap, a));
 //static_assert(test(std::ranges::prev_permutation, a));
 //static_assert(test(std::ranges::push_heap, a));
-//static_assert(test(std::ranges::remove, a, 42));
+static_assert(test(std::ranges::remove, a, 42));
 //static_assert(test(std::ranges::remove_copy, a, a, 42));
 //static_assert(test(std::ranges::remove_copy_if, a, a, odd));
-//static_assert(test(std::ranges::remove_if, a, odd));
+static_assert(test(std::ranges::remove_if, a, odd));
 static_assert(test(std::ranges::replace, a, 42, 43));
 //static_assert(test(std::ranges::replace_copy, a, a, 42, 43));
 //static_assert(test(std::ranges::replace_copy_if, a, a, odd, 43));