diff --git a/advanced-tools/clang.rst b/advanced-tools/clang.rst
index d626c33ea..1f693fcae 100644
--- a/advanced-tools/clang.rst
+++ b/advanced-tools/clang.rst
@@ -110,7 +110,7 @@ After ``make install`` executes, the compilers will be installed in
     libclang_rt.lsan-x86_64.a   libclang_rt.ubsan_cxx-x86_64.a
     libclang_rt.msan-x86_64.a   libclang_rt.ubsan-x86_64.a
 
-On Mac OS X, the libraries are installed in
+On macOS, the libraries are installed in
 ``/usr/local/lib/clang/3.3/lib/darwin/``:
 
 .. code-block:: console
diff --git a/core-developers/experts.rst b/core-developers/experts.rst
index e7b80febc..ddacdf7f4 100644
--- a/core-developers/experts.rst
+++ b/core-developers/experts.rst
@@ -299,7 +299,7 @@ Cygwin                jlt63^, stutzbach^
 FreeBSD
 HP-UX
 Linux
-Mac OS X              ronaldoussoren, ned-deily
+macOS                 ronaldoussoren, ned-deily
 NetBSD1
 OS2/EMX               aimacintyre^
 Solaris/OpenIndiana   jcea
diff --git a/getting-started/pull-request-lifecycle.rst b/getting-started/pull-request-lifecycle.rst
index fa6077d51..82953d0aa 100644
--- a/getting-started/pull-request-lifecycle.rst
+++ b/getting-started/pull-request-lifecycle.rst
@@ -241,7 +241,7 @@ should do to help ensure that your pull request is accepted.
 ``patchcheck`` is a simple automated patch checklist that guides a developer
 through the common patch generation checks. To run ``patchcheck``:
 
-   On *UNIX* (including Mac OS X)::
+   On *UNIX* (including macOS)::
 
       make patchcheck
 
diff --git a/getting-started/setup-building.rst b/getting-started/setup-building.rst
index cd0f47c22..84d18ccdb 100644
--- a/getting-started/setup-building.rst
+++ b/getting-started/setup-building.rst
@@ -209,7 +209,7 @@ If you decide to :ref:`build-dependencies`, you will need to re-run both
 Once CPython is done building you will then have a working build
 that can be run in-place; ``./python`` on most machines (and what is used in
 all examples), ``./python.exe`` wherever a case-insensitive filesystem is used
-(e.g. on OS X by default), in order to avoid conflicts with the ``Python``
+(e.g. on macOS by default), in order to avoid conflicts with the ``Python``
 directory. There is normally no need to install your built copy
 of Python! The interpreter will realize where it is being run from
 and thus use the files found in the working copy.  If you are worried
@@ -326,7 +326,7 @@ Install dependencies
 ====================
 
 This section explains how to install additional extensions (e.g. ``zlib``)
-on :ref:`Linux <deps-on-linux>` and :ref:`macOs/OS X <macOS>`.  On Windows,
+on :ref:`Linux <deps-on-linux>` and :ref:`macOS`.  On Windows,
 extensions are already included and built automatically.
 
 .. _deps-on-linux:
@@ -385,7 +385,7 @@ their dependencies::
          lzma lzma-dev tk-dev uuid-dev zlib1g-dev
 
 
-.. _MacOS:
+.. _macOS:
 
 macOS and OS X
 --------------
@@ -610,7 +610,7 @@ every rule.
      The part of the standard library implemented in pure Python.
 
 ``Mac``
-     Mac-specific code (e.g., using IDLE as an OS X application).
+     Mac-specific code (e.g., using IDLE as a macOS application).
 
 ``Misc``
      Things that do not belong elsewhere. Typically this is varying kinds of
diff --git a/index.rst b/index.rst
index 1f8a2ce2c..a336f9a07 100644
--- a/index.rst
+++ b/index.rst
@@ -27,7 +27,7 @@ instructions please see the :ref:`setup guide <setup>`.
       git clone https://github.com/<your_username>/cpython
       cd cpython
 
-3. Build Python, on UNIX and Mac OS use::
+3. Build Python, on UNIX and macOS use::
 
       ./configure --with-pydebug && make -j
 
@@ -40,13 +40,13 @@ instructions please see the :ref:`setup guide <setup>`.
    See also :ref:`more detailed instructions <compiling>`,
    :ref:`how to install and build dependencies <build-dependencies>`,
    and the platform-specific pages for :ref:`UNIX <unix-compiling>`,
-   :ref:`Mac OS <MacOS>`, and :ref:`Windows <windows-compiling>`.
+   :ref:`macOS`, and :ref:`Windows <windows-compiling>`.
 
 4. :ref:`Run the tests <runtests>`::
 
       ./python -m test -j3
 
-   On :ref:`most <mac-python.exe>` Mac OS X systems, replace :file:`./python`
+   On :ref:`most <mac-python.exe>` macOS systems, replace :file:`./python`
    with :file:`./python.exe`.  On Windows, use :file:`python.bat`.
 
 5. Create a new branch where your work for the issue will go, e.g.::
@@ -190,7 +190,6 @@ Key Resources
 * Source code
     * `Browse online <https://github.com/python/cpython/>`_
     * `Snapshot of the *main* branch <https://github.com/python/cpython/archive/main.zip>`_
-    * `Daily OS X installer <https://buildbot.python.org/daily-dmg/>`_
 * PEPs_ (Python Enhancement Proposals)
 * :ref:`help`
 * :ref:`developers`
diff --git a/testing/coverage.rst b/testing/coverage.rst
index 48c928993..df44ef495 100644
--- a/testing/coverage.rst
+++ b/testing/coverage.rst
@@ -93,7 +93,7 @@ On Unix run::
     source ../cpython-venv/bin/activate
     pip install coverage
 
-On :ref:`most <mac-python.exe>` Mac OS X systems run::
+On :ref:`most <mac-python.exe>` macOS systems run::
 
     ./python.exe -m venv ../cpython-venv
     source ../cpython-venv/bin/activate
diff --git a/testing/run-write-tests.rst b/testing/run-write-tests.rst
index b1813be9c..f9323463a 100644
--- a/testing/run-write-tests.rst
+++ b/testing/run-write-tests.rst
@@ -22,7 +22,7 @@ from the root directory of your checkout (after you have
     ./python -m test
 
 You may need to change this command as follows throughout this section.
-On :ref:`most <mac-python.exe>` Mac OS X systems, replace :file:`./python`
+On :ref:`most <mac-python.exe>` macOS systems, replace :file:`./python`
 with :file:`./python.exe`.  On Windows, use :file:`python.bat`.  If using
 Python 2.7, replace ``test`` with ``test.regrtest``.