diff --git a/libcxx/CMakeLists.txt b/libcxx/CMakeLists.txt
--- a/libcxx/CMakeLists.txt
+++ b/libcxx/CMakeLists.txt
@@ -68,7 +68,6 @@
 option(LIBCXX_ENABLE_FILESYSTEM "Build filesystem as part of the main libc++ library"
     ${ENABLE_FILESYSTEM_DEFAULT})
 option(LIBCXX_INCLUDE_TESTS "Build the libc++ tests." ${LLVM_INCLUDE_TESTS})
-option(LIBCXX_ENABLE_PARALLEL_ALGORITHMS "Enable the parallel algorithms library. This requires the PSTL to be available." OFF)
 option(LIBCXX_ENABLE_DEBUG_MODE
   "Whether to build libc++ with the debug mode enabled.
    By default, this is turned off. Turning it on results in a different ABI (additional
diff --git a/libcxx/include/algorithm b/libcxx/include/algorithm
--- a/libcxx/include/algorithm
+++ b/libcxx/include/algorithm
@@ -1917,10 +1917,6 @@
 #  pragma GCC system_header
 #endif
 
-#if defined(_LIBCPP_HAS_PARALLEL_ALGORITHMS) && _LIBCPP_STD_VER >= 17
-#  include <__pstl_algorithm>
-#endif
-
 #if !defined(_LIBCPP_REMOVE_TRANSITIVE_INCLUDES) && _LIBCPP_STD_VER <= 17
 #  include <chrono>
 #endif
diff --git a/libcxx/include/execution b/libcxx/include/execution
--- a/libcxx/include/execution
+++ b/libcxx/include/execution
@@ -14,10 +14,6 @@
 #include <__config>
 #include <version>
 
-#if defined(_LIBCPP_HAS_PARALLEL_ALGORITHMS) && _LIBCPP_STD_VER >= 17
-#   include <__pstl_execution>
-#endif
-
 #if !defined(_LIBCPP_HAS_NO_PRAGMA_SYSTEM_HEADER)
 #  pragma GCC system_header
 #endif
diff --git a/libcxx/include/memory b/libcxx/include/memory
--- a/libcxx/include/memory
+++ b/libcxx/include/memory
@@ -912,10 +912,6 @@
 #  pragma GCC system_header
 #endif
 
-#if defined(_LIBCPP_HAS_PARALLEL_ALGORITHMS) && _LIBCPP_STD_VER >= 17
-#   include <__pstl_memory>
-#endif
-
 #if !defined(_LIBCPP_REMOVE_TRANSITIVE_INCLUDES) && _LIBCPP_STD_VER <= 20
 #  include <atomic>
 #  include <concepts>
diff --git a/libcxx/include/numeric b/libcxx/include/numeric
--- a/libcxx/include/numeric
+++ b/libcxx/include/numeric
@@ -167,10 +167,6 @@
 #  pragma GCC system_header
 #endif
 
-#if defined(_LIBCPP_HAS_PARALLEL_ALGORITHMS) && _LIBCPP_STD_VER >= 17
-#   include <__pstl_numeric>
-#endif
-
 #if !defined(_LIBCPP_REMOVE_TRANSITIVE_INCLUDES) && _LIBCPP_STD_VER <= 20
 #  include <concepts>
 #  include <functional>
diff --git a/libcxx/src/CMakeLists.txt b/libcxx/src/CMakeLists.txt
--- a/libcxx/src/CMakeLists.txt
+++ b/libcxx/src/CMakeLists.txt
@@ -181,16 +181,6 @@
   endif()
 endif()
 
-if (LIBCXX_ENABLE_PARALLEL_ALGORITHMS AND NOT TARGET pstl::ParallelSTL)
-  message(FATAL_ERROR "Could not find ParallelSTL")
-endif()
-
-function(cxx_set_common_defines name)
-  if (LIBCXX_ENABLE_PARALLEL_ALGORITHMS)
-    target_link_libraries(${name} PUBLIC pstl::ParallelSTL)
-  endif()
-endfunction()
-
 split_list(LIBCXX_COMPILE_FLAGS)
 split_list(LIBCXX_LINK_FLAGS)
 
@@ -210,7 +200,6 @@
       DEFINE_SYMBOL ""
   )
   cxx_add_common_build_flags(cxx_shared)
-  cxx_set_common_defines(cxx_shared)
 
   if(ZOS)
     add_custom_command(TARGET cxx_shared POST_BUILD
@@ -302,7 +291,6 @@
       OUTPUT_NAME   "${LIBCXX_STATIC_OUTPUT_NAME}"
   )
   cxx_add_common_build_flags(cxx_static)
-  cxx_set_common_defines(cxx_static)
 
   if (LIBCXX_HERMETIC_STATIC_LIBRARY)
     # If the hermetic library doesn't define the operator new/delete functions
@@ -411,14 +399,10 @@
     if(LIBCXX_INSTALL_HEADERS)
       set(header_install_target install-cxx-headers)
     endif()
-    if (LIBCXX_ENABLE_PARALLEL_ALGORITHMS)
-      set(pstl_install_target install-pstl)
-    endif()
     add_custom_target(install-cxx
                       DEPENDS ${lib_install_target}
                               cxx_experimental
                               ${header_install_target}
-                              ${pstl_install_target}
                       COMMAND "${CMAKE_COMMAND}"
                       -DCMAKE_INSTALL_COMPONENT=cxx
                       -P "${LIBCXX_BINARY_DIR}/cmake_install.cmake")
@@ -426,7 +410,6 @@
                       DEPENDS ${lib_install_target}
                               cxx_experimental
                               ${header_install_target}
-                              ${pstl_install_target}
                       COMMAND "${CMAKE_COMMAND}"
                       -DCMAKE_INSTALL_COMPONENT=cxx
                       -DCMAKE_INSTALL_DO_STRIP=1
diff --git a/libcxx/test/std/pstl b/libcxx/test/std/pstl
deleted file mode 120000
--- a/libcxx/test/std/pstl
+++ /dev/null
@@ -1 +0,0 @@
-../../../pstl/test/std
\ No newline at end of file
diff --git a/libcxx/utils/data/ignore_format.txt b/libcxx/utils/data/ignore_format.txt
--- a/libcxx/utils/data/ignore_format.txt
+++ b/libcxx/utils/data/ignore_format.txt
@@ -309,7 +309,6 @@
 libcxx/include/__debug_utils/randomize_range.h
 libcxx/include/deque
 libcxx/include/errno.h
-libcxx/include/execution
 libcxx/include/expected
 libcxx/include/__expected/expected.h
 libcxx/include/experimental/__config
diff --git a/libcxxabi/src/CMakeLists.txt b/libcxxabi/src/CMakeLists.txt
--- a/libcxxabi/src/CMakeLists.txt
+++ b/libcxxabi/src/CMakeLists.txt
@@ -154,10 +154,6 @@
   string(REPLACE "-Wl,-z,defs" "" CMAKE_SHARED_LINKER_FLAGS "${CMAKE_SHARED_LINKER_FLAGS}")
 endif()
 
-if (NOT TARGET pstl::ParallelSTL)
-  message(STATUS "Could not find ParallelSTL, libc++abi will not attempt to use it but the build may fail if the libc++ in use needs it to be available.")
-endif()
-
 include(WarningFlags)
 
 # Build the shared library.
@@ -208,9 +204,6 @@
   target_link_libraries(cxxabi_shared
     PUBLIC cxxabi_shared_objects
     PRIVATE ${LIBCXXABI_SHARED_LIBRARIES} ${LIBCXXABI_LIBRARIES})
-  if (TARGET pstl::ParallelSTL)
-    target_link_libraries(cxxabi_shared PUBLIC pstl::ParallelSTL)
-  endif()
 
   list(APPEND LIBCXXABI_BUILD_TARGETS "cxxabi_shared")
   if (LIBCXXABI_INSTALL_SHARED_LIBRARY)
@@ -294,9 +287,6 @@
   target_link_libraries(cxxabi_static
     PUBLIC cxxabi_static_objects
     PRIVATE ${LIBCXXABI_STATIC_LIBRARIES} ${LIBCXXABI_LIBRARIES})
-  if (TARGET pstl::ParallelSTL)
-    target_link_libraries(cxxabi_static PUBLIC pstl::ParallelSTL)
-  endif()
 
   list(APPEND LIBCXXABI_BUILD_TARGETS "cxxabi_static")
   if (LIBCXXABI_INSTALL_STATIC_LIBRARY)