diff --git a/libcxx/docs/ReleaseNotes.rst b/libcxx/docs/ReleaseNotes.rst
--- a/libcxx/docs/ReleaseNotes.rst
+++ b/libcxx/docs/ReleaseNotes.rst
@@ -52,6 +52,10 @@
   ``<filesystem>`` header. The associated macro
   ``_LIBCPP_DEPRECATED_EXPERIMENTAL_FILESYSTEM`` has also been removed.
 
+- Transitive includes of ``<algorithm>`` have been removed. If you see compiler errors
+  related to missing declarations inside namespace ``std`` when updating libc++,
+  you are probably missing ``#include <algorithm>`` in a file where you use algorithms.
+
 ABI Changes
 -----------
 
diff --git a/libcxx/include/__bit_reference b/libcxx/include/__bit_reference
--- a/libcxx/include/__bit_reference
+++ b/libcxx/include/__bit_reference
@@ -10,9 +10,13 @@
 #ifndef _LIBCPP___BIT_REFERENCE
 #define _LIBCPP___BIT_REFERENCE
 
+#include <__algorithm/min.h>
 #include <__bits>
 #include <__config>
-#include <algorithm>
+#include <__iterator/iterator_traits.h>
+#include <__memory/pointer_traits.h>
+#include <cstring>
+#include <type_traits>
 
 #if !defined(_LIBCPP_HAS_NO_PRAGMA_SYSTEM_HEADER)
 #  pragma GCC system_header
diff --git a/libcxx/include/__filesystem/path.h b/libcxx/include/__filesystem/path.h
--- a/libcxx/include/__filesystem/path.h
+++ b/libcxx/include/__filesystem/path.h
@@ -10,6 +10,8 @@
 #ifndef _LIBCPP___FILESYSTEM_PATH_H
 #define _LIBCPP___FILESYSTEM_PATH_H
 
+#include <__algorithm/replace.h>
+#include <__algorithm/replace_copy.h>
 #include <__availability>
 #include <__config>
 #include <__iterator/back_insert_iterator.h>
diff --git a/libcxx/include/__format/formatter.h b/libcxx/include/__format/formatter.h
--- a/libcxx/include/__format/formatter.h
+++ b/libcxx/include/__format/formatter.h
@@ -12,6 +12,7 @@
 
 #include <__algorithm/copy.h>
 #include <__algorithm/fill_n.h>
+#include <__algorithm/transform.h>
 #include <__availability>
 #include <__config>
 #include <__format/format_error.h>
diff --git a/libcxx/include/__hash_table b/libcxx/include/__hash_table
--- a/libcxx/include/__hash_table
+++ b/libcxx/include/__hash_table
@@ -10,10 +10,12 @@
 #ifndef _LIBCPP__HASH_TABLE
 #define _LIBCPP__HASH_TABLE
 
+#include <__algorithm/max.h>
+#include <__algorithm/min.h>
 #include <__bits> // __libcpp_clz
 #include <__config>
 #include <__debug>
-#include <algorithm>
+#include <__functional/hash.h>
 #include <cmath>
 #include <initializer_list>
 #include <iterator>
diff --git a/libcxx/include/__split_buffer b/libcxx/include/__split_buffer
--- a/libcxx/include/__split_buffer
+++ b/libcxx/include/__split_buffer
@@ -2,9 +2,17 @@
 #ifndef _LIBCPP_SPLIT_BUFFER
 #define _LIBCPP_SPLIT_BUFFER
 
+#include <__algorithm/max.h>
+#include <__algorithm/move.h>
+#include <__algorithm/move_backward.h>
 #include <__config>
+#include <__iterator/distance.h>
+#include <__iterator/iterator_traits.h>
+#include <__iterator/move_iterator.h>
+#include <__memory/allocator.h>
+#include <__memory/compressed_pair.h>
 #include <__utility/forward.h>
-#include <algorithm>
+#include <memory>
 #include <type_traits>
 
 #if !defined(_LIBCPP_HAS_NO_PRAGMA_SYSTEM_HEADER)
diff --git a/libcxx/include/__tree b/libcxx/include/__tree
--- a/libcxx/include/__tree
+++ b/libcxx/include/__tree
@@ -10,9 +10,9 @@
 #ifndef _LIBCPP___TREE
 #define _LIBCPP___TREE
 
+#include <__algorithm/min.h>
 #include <__config>
 #include <__utility/forward.h>
-#include <algorithm>
 #include <iterator>
 #include <limits>
 #include <memory>
diff --git a/libcxx/include/array b/libcxx/include/array
--- a/libcxx/include/array
+++ b/libcxx/include/array
@@ -108,11 +108,14 @@
 
 */
 
+#include <__algorithm/equal.h>
+#include <__algorithm/fill_n.h>
+#include <__algorithm/lexicographical_compare.h>
+#include <__algorithm/swap_ranges.h>
 #include <__config>
 #include <__debug>
 #include <__tuple>
 #include <__utility/unreachable.h>
-#include <algorithm>
 #include <iterator>
 #include <stdexcept>
 #include <type_traits>
diff --git a/libcxx/include/bitset b/libcxx/include/bitset
--- a/libcxx/include/bitset
+++ b/libcxx/include/bitset
@@ -112,8 +112,10 @@
 
 */
 
+#include <__algorithm/fill.h>
 #include <__bit_reference>
 #include <__config>
+#include <__functional/unary_function.h>
 #include <climits>
 #include <cstddef>
 #include <iosfwd>
diff --git a/libcxx/include/deque b/libcxx/include/deque
--- a/libcxx/include/deque
+++ b/libcxx/include/deque
@@ -160,12 +160,20 @@
 
 */
 
+#include <__algorithm/copy.h>
+#include <__algorithm/copy_backward.h>
+#include <__algorithm/equal.h>
+#include <__algorithm/fill_n.h>
+#include <__algorithm/lexicographical_compare.h>
+#include <__algorithm/min.h>
+#include <__algorithm/remove.h>
+#include <__algorithm/remove_if.h>
+#include <__algorithm/unwrap_iter.h>
 #include <__config>
 #include <__debug>
 #include <__iterator/iterator_traits.h>
 #include <__split_buffer>
 #include <__utility/forward.h>
-#include <algorithm>
 #include <compare>
 #include <initializer_list>
 #include <iterator>
diff --git a/libcxx/include/experimental/functional b/libcxx/include/experimental/functional
--- a/libcxx/include/experimental/functional
+++ b/libcxx/include/experimental/functional
@@ -62,7 +62,6 @@
 
 #include <__debug>
 #include <__memory/uses_allocator.h>
-#include <algorithm>
 #include <array>
 #include <experimental/__config>
 #include <functional>
diff --git a/libcxx/include/experimental/simd b/libcxx/include/experimental/simd
--- a/libcxx/include/experimental/simd
+++ b/libcxx/include/experimental/simd
@@ -649,7 +649,6 @@
 
 */
 
-#include <algorithm>
 #include <array>
 #include <cstddef>
 #include <experimental/__config>
diff --git a/libcxx/include/ext/hash_map b/libcxx/include/ext/hash_map
--- a/libcxx/include/ext/hash_map
+++ b/libcxx/include/ext/hash_map
@@ -201,6 +201,7 @@
 
 */
 
+#include <__algorithm/is_permutation.h>
 #include <__config>
 #include <__hash_table>
 #include <ext/__hash>
diff --git a/libcxx/include/ext/hash_set b/libcxx/include/ext/hash_set
--- a/libcxx/include/ext/hash_set
+++ b/libcxx/include/ext/hash_set
@@ -192,6 +192,7 @@
 
 */
 
+#include <__algorithm/is_permutation.h>
 #include <__config>
 #include <__hash_table>
 #include <ext/__hash>
diff --git a/libcxx/include/format b/libcxx/include/format
--- a/libcxx/include/format
+++ b/libcxx/include/format
@@ -122,6 +122,7 @@
 // Enable the contents of the header only when libc++ was built with LIBCXX_ENABLE_INCOMPLETE_FEATURES.
 #if !defined(_LIBCPP_HAS_NO_INCOMPLETE_FORMAT)
 
+#include <__algorithm/clamp.h>
 #include <__config>
 #include <__debug>
 #include <__format/format_arg.h>
diff --git a/libcxx/include/forward_list b/libcxx/include/forward_list
--- a/libcxx/include/forward_list
+++ b/libcxx/include/forward_list
@@ -179,9 +179,11 @@
 
 */
 
+#include <__algorithm/comp.h>
+#include <__algorithm/lexicographical_compare.h>
+#include <__algorithm/min.h>
 #include <__config>
 #include <__utility/forward.h>
-#include <algorithm>
 #include <initializer_list>
 #include <iterator>
 #include <limits>
diff --git a/libcxx/include/fstream b/libcxx/include/fstream
--- a/libcxx/include/fstream
+++ b/libcxx/include/fstream
@@ -179,6 +179,7 @@
 
 */
 
+#include <__algorithm/max.h>
 #include <__availability>
 #include <__config>
 #include <__debug>
diff --git a/libcxx/include/list b/libcxx/include/list
--- a/libcxx/include/list
+++ b/libcxx/include/list
@@ -180,10 +180,13 @@
 
 */
 
+#include <__algorithm/comp.h>
+#include <__algorithm/equal.h>
+#include <__algorithm/lexicographical_compare.h>
+#include <__algorithm/min.h>
 #include <__config>
 #include <__debug>
 #include <__utility/forward.h>
-#include <algorithm>
 #include <initializer_list>
 #include <iterator>
 #include <limits>
diff --git a/libcxx/include/locale b/libcxx/include/locale
--- a/libcxx/include/locale
+++ b/libcxx/include/locale
@@ -187,10 +187,14 @@
 
 */
 
+#include <__algorithm/equal.h>
+#include <__algorithm/find.h>
+#include <__algorithm/max.h>
+#include <__algorithm/reverse.h>
+#include <__algorithm/unwrap_iter.h>
 #include <__config>
 #include <__debug>
 #include <__locale>
-#include <algorithm>
 #ifndef __APPLE__
 # include <cstdarg>
 #endif
diff --git a/libcxx/include/map b/libcxx/include/map
--- a/libcxx/include/map
+++ b/libcxx/include/map
@@ -528,6 +528,8 @@
 
 */
 
+#include <__algorithm/equal.h>
+#include <__algorithm/lexicographical_compare.h>
 #include <__config>
 #include <__debug>
 #include <__functional/is_transparent.h>
diff --git a/libcxx/include/queue b/libcxx/include/queue
--- a/libcxx/include/queue
+++ b/libcxx/include/queue
@@ -217,11 +217,13 @@
 
 */
 
+#include <__algorithm/make_heap.h>
+#include <__algorithm/pop_heap.h>
+#include <__algorithm/push_heap.h>
 #include <__config>
 #include <__iterator/iterator_traits.h>
 #include <__memory/uses_allocator.h>
 #include <__utility/forward.h>
-#include <algorithm>
 #include <compare>
 #include <deque>
 #include <functional>
diff --git a/libcxx/include/random b/libcxx/include/random
--- a/libcxx/include/random
+++ b/libcxx/include/random
@@ -1717,7 +1717,6 @@
 #include <initializer_list>
 #include <version>
 
-#include <algorithm>   // for backward compatibility; TODO remove it
 #include <cmath>       // for backward compatibility; TODO remove it
 #include <cstddef>     // for backward compatibility; TODO remove it
 #include <cstdint>     // for backward compatibility; TODO remove it
diff --git a/libcxx/include/regex b/libcxx/include/regex
--- a/libcxx/include/regex
+++ b/libcxx/include/regex
@@ -762,6 +762,7 @@
 } // std
 */
 
+#include <__algorithm/find.h>
 #include <__config>
 #include <__debug>
 #include <__iterator/wrap_iter.h>
diff --git a/libcxx/include/set b/libcxx/include/set
--- a/libcxx/include/set
+++ b/libcxx/include/set
@@ -471,6 +471,8 @@
 
 */
 
+#include <__algorithm/equal.h>
+#include <__algorithm/lexicographical_compare.h>
 #include <__config>
 #include <__debug>
 #include <__functional/is_transparent.h>
diff --git a/libcxx/include/string b/libcxx/include/string
--- a/libcxx/include/string
+++ b/libcxx/include/string
@@ -518,11 +518,14 @@
 
 */
 
+#include <__algorithm/max.h>
+#include <__algorithm/min.h>
+#include <__algorithm/remove.h>
+#include <__algorithm/remove_if.h>
 #include <__config>
 #include <__debug>
 #include <__ios/fpos.h>
 #include <__iterator/wrap_iter.h>
-#include <algorithm>
 #include <compare>
 #include <cstdio>  // EOF
 #include <cstdlib>
diff --git a/libcxx/include/string_view b/libcxx/include/string_view
--- a/libcxx/include/string_view
+++ b/libcxx/include/string_view
@@ -195,6 +195,7 @@
 
 */
 
+#include <__algorithm/min.h>
 #include <__config>
 #include <__debug>
 #include <__ranges/concepts.h>
@@ -203,7 +204,6 @@
 #include <__ranges/enable_view.h>
 #include <__ranges/size.h>
 #include <__string>
-#include <algorithm>
 #include <compare>
 #include <iosfwd>
 #include <iterator>
diff --git a/libcxx/include/unordered_map b/libcxx/include/unordered_map
--- a/libcxx/include/unordered_map
+++ b/libcxx/include/unordered_map
@@ -514,6 +514,7 @@
 
 */
 
+#include <__algorithm/is_permutation.h>
 #include <__config>
 #include <__debug>
 #include <__functional/is_transparent.h>
diff --git a/libcxx/include/unordered_set b/libcxx/include/unordered_set
--- a/libcxx/include/unordered_set
+++ b/libcxx/include/unordered_set
@@ -459,6 +459,7 @@
 
 */
 
+#include <__algorithm/is_permutation.h>
 #include <__config>
 #include <__debug>
 #include <__functional/is_transparent.h>
diff --git a/libcxx/include/valarray b/libcxx/include/valarray
--- a/libcxx/include/valarray
+++ b/libcxx/include/valarray
@@ -341,8 +341,14 @@
 
 */
 
+#include <__algorithm/copy.h>
+#include <__algorithm/count.h>
+#include <__algorithm/fill.h>
+#include <__algorithm/max_element.h>
+#include <__algorithm/min.h>
+#include <__algorithm/min_element.h>
+#include <__algorithm/unwrap_iter.h>
 #include <__config>
-#include <algorithm>
 #include <cmath>
 #include <cstddef>
 #include <functional>
diff --git a/libcxx/include/vector b/libcxx/include/vector
--- a/libcxx/include/vector
+++ b/libcxx/include/vector
@@ -271,14 +271,22 @@
 
 */
 
+#include <__algorithm/copy.h>
+#include <__algorithm/equal.h>
+#include <__algorithm/fill_n.h>
+#include <__algorithm/lexicographical_compare.h>
+#include <__algorithm/remove.h>
+#include <__algorithm/remove_if.h>
+#include <__algorithm/rotate.h>
+#include <__algorithm/unwrap_iter.h>
 #include <__bit_reference>
 #include <__config>
 #include <__debug>
+#include <__functional/hash.h>
 #include <__iterator/iterator_traits.h>
 #include <__iterator/wrap_iter.h>
 #include <__split_buffer>
 #include <__utility/forward.h>
-#include <algorithm>
 #include <climits>
 #include <compare>
 #include <cstdlib>
diff --git a/libcxx/test/std/containers/sequences/forwardlist/forwardlist.cons/deduct.pass.cpp b/libcxx/test/std/containers/sequences/forwardlist/forwardlist.cons/deduct.pass.cpp
--- a/libcxx/test/std/containers/sequences/forwardlist/forwardlist.cons/deduct.pass.cpp
+++ b/libcxx/test/std/containers/sequences/forwardlist/forwardlist.cons/deduct.pass.cpp
@@ -14,6 +14,7 @@
 //    -> forward_list<typename iterator_traits<InputIterator>::value_type, Allocator>;
 //
 
+#include <algorithm>
 #include <forward_list>
 #include <iterator>
 #include <cassert>
diff --git a/libcxx/test/std/containers/sequences/list/list.ops/sort.pass.cpp b/libcxx/test/std/containers/sequences/list/list.ops/sort.pass.cpp
--- a/libcxx/test/std/containers/sequences/list/list.ops/sort.pass.cpp
+++ b/libcxx/test/std/containers/sequences/list/list.ops/sort.pass.cpp
@@ -10,6 +10,7 @@
 
 // void sort();
 
+#include <algorithm>
 #include <list>
 #include <random>
 #include <vector>
diff --git a/libcxx/test/std/utilities/format/format.formatter/format.formatter.spec/formatter.floating_point.pass.cpp b/libcxx/test/std/utilities/format/format.formatter/format.formatter.spec/formatter.floating_point.pass.cpp
--- a/libcxx/test/std/utilities/format/format.formatter/format.formatter.spec/formatter.floating_point.pass.cpp
+++ b/libcxx/test/std/utilities/format/format.formatter/format.formatter.spec/formatter.floating_point.pass.cpp
@@ -26,6 +26,7 @@
 
 #include <format>
 
+#include <algorithm>
 #include <array>
 #include <cassert>
 #include <cmath>
diff --git a/libcxxabi/src/demangle/Utility.h b/libcxxabi/src/demangle/Utility.h
--- a/libcxxabi/src/demangle/Utility.h
+++ b/libcxxabi/src/demangle/Utility.h
@@ -17,6 +17,7 @@
 #define DEMANGLE_UTILITY_H
 
 #include "StringView.h"
+#include <algorithm>
 #include <array>
 #include <cstdint>
 #include <cstdlib>
diff --git a/libcxxabi/test/test_demangle.pass.cpp b/libcxxabi/test/test_demangle.pass.cpp
--- a/libcxxabi/test/test_demangle.pass.cpp
+++ b/libcxxabi/test/test_demangle.pass.cpp
@@ -15,6 +15,7 @@
 // UNSUPPORTED: use_system_cxx_lib && target={{.+}}-apple-macosx11.0
 
 #include "support/timer.h"
+#include <algorithm>
 #include <cassert>
 #include <cstdio>
 #include <cstdlib>