diff --git a/Lib/test/test_capi/test_misc.py b/Lib/test/test_capi/test_misc.py
index ada30181aeeca94..d52e4c0c4026393 100644
--- a/Lib/test/test_capi/test_misc.py
+++ b/Lib/test/test_capi/test_misc.py
@@ -20,13 +20,16 @@
 import weakref
 import operator
 from test import support
-from test.support import MISSING_C_DOCSTRINGS
-from test.support import import_helper
-from test.support import threading_helper
-from test.support import warnings_helper
-from test.support import requires_limited_api
-from test.support import expected_failure_if_gil_disabled
-from test.support import Py_GIL_DISABLED
+from test.support import (
+    MISSING_C_DOCSTRINGS,
+    Py_GIL_DISABLED,
+    expected_failure_if_gil_disabled,
+    force_not_colorized_test_class,
+    import_helper,
+    requires_limited_api,
+    threading_helper,
+    warnings_helper,
+)
 from test.support.script_helper import assert_python_failure, assert_python_ok, run_python_until_end
 try:
     import _posixsubprocess
@@ -75,6 +78,8 @@ class InstanceMethod:
     id = _testcapi.instancemethod(id)
     testfunction = _testcapi.instancemethod(testfunction)
 
+
+@force_not_colorized_test_class
 class CAPITest(unittest.TestCase):
 
     def test_instancemethod(self):
diff --git a/Lib/test/test_cmd_line_script.py b/Lib/test/test_cmd_line_script.py
index f30107225ff612a..73c30774a9da41b 100644
--- a/Lib/test/test_cmd_line_script.py
+++ b/Lib/test/test_cmd_line_script.py
@@ -14,7 +14,12 @@
 
 import textwrap
 from test import support
-from test.support import import_helper, is_apple, os_helper
+from test.support import (
+    force_not_colorized_test_class,
+    import_helper,
+    is_apple,
+    os_helper,
+)
 from test.support.script_helper import (
     make_pkg, make_script, make_zip_pkg, make_zip_script,
     assert_python_ok, assert_python_failure, spawn_python, kill_python)
@@ -88,6 +93,8 @@ def _make_test_zip_pkg(zip_dir, zip_basename, pkg_name, script_basename,
     importlib.invalidate_caches()
     return to_return
 
+
+@force_not_colorized_test_class
 class CmdLineTest(unittest.TestCase):
     def _check_output(self, script_name, exit_code, data,
                              expected_file, expected_argv0,
diff --git a/Lib/test/test_compileall.py b/Lib/test/test_compileall.py
index 3a34c6822bc0793..7b12e4f0e47daab 100644
--- a/Lib/test/test_compileall.py
+++ b/Lib/test/test_compileall.py
@@ -26,6 +26,7 @@
     _have_multiprocessing = False
 
 from test import support
+from test.support import force_not_colorized
 from test.support import os_helper
 from test.support import script_helper
 from test.test_py_compile import without_source_date_epoch
@@ -766,6 +767,7 @@ def test_d_compile_error(self):
         rc, out, err = self.assertRunNotOK('-q', '-d', 'dinsdale', self.pkgdir)
         self.assertRegex(out, b'File "dinsdale')
 
+    @force_not_colorized
     def test_d_runtime_error(self):
         bazfn = script_helper.make_script(self.pkgdir, 'baz', 'raise Exception')
         self.assertRunOK('-q', '-d', 'dinsdale', self.pkgdir)
diff --git a/Lib/test/test_eof.py b/Lib/test/test_eof.py
index e377383450e19d5..582e5b6de6e6870 100644
--- a/Lib/test/test_eof.py
+++ b/Lib/test/test_eof.py
@@ -2,7 +2,7 @@
 
 import sys
 from codecs import BOM_UTF8
-from test import support
+from test.support import force_not_colorized
 from test.support import os_helper
 from test.support import script_helper
 from test.support import warnings_helper
@@ -44,6 +44,7 @@ def test_EOFS(self):
         self.assertEqual(cm.exception.text, "ä = '''thîs is ")
         self.assertEqual(cm.exception.offset, 5)
 
+    @force_not_colorized
     def test_EOFS_with_file(self):
         expect = ("(<string>, line 1)")
         with os_helper.temp_dir() as temp_dir:
@@ -123,6 +124,7 @@ def test_line_continuation_EOF(self):
         self.assertEqual(str(cm.exception), expect)
 
     @unittest.skipIf(not sys.executable, "sys.executable required")
+    @force_not_colorized
     def test_line_continuation_EOF_from_file_bpo2180(self):
         """Ensure tok_nextc() does not add too many ending newlines."""
         with os_helper.temp_dir() as temp_dir:
diff --git a/Lib/test/test_exceptions.py b/Lib/test/test_exceptions.py
index 206e22e791e02a6..0a1f873bcbf9f54 100644
--- a/Lib/test/test_exceptions.py
+++ b/Lib/test/test_exceptions.py
@@ -11,11 +11,17 @@
 from itertools import product
 from textwrap import dedent
 
-from test.support import (captured_stderr, check_impl_detail,
-                          cpython_only, gc_collect,
-                          no_tracing, script_helper,
-                          SuppressCrashReport,
-                          force_not_colorized)
+from test.support import (
+    SuppressCrashReport,
+    captured_stderr,
+    check_impl_detail,
+    cpython_only,
+    force_not_colorized,
+    force_not_colorized_test_class,
+    gc_collect,
+    no_tracing,
+    script_helper,
+)
 from test.support.import_helper import import_module
 from test.support.os_helper import TESTFN, unlink
 from test.support.warnings_helper import check_warnings
@@ -1465,6 +1471,7 @@ def gen():
 
     @cpython_only
     @unittest.skipIf(_testcapi is None, "requires _testcapi")
+    @force_not_colorized
     def test_recursion_normalizing_infinite_exception(self):
         # Issue #30697. Test that a RecursionError is raised when
         # maximum recursion depth has been exceeded when creating
@@ -2180,6 +2187,7 @@ def test_multiline_not_highlighted(self):
                 self.assertEqual(result[-len(expected):], expected)
 
 
+@force_not_colorized_test_class
 class SyntaxErrorTests(unittest.TestCase):
     maxDiff = None
 
diff --git a/Lib/test/test_import/__init__.py b/Lib/test/test_import/__init__.py
index 83efbc1e25e77af..3c52cb6ca831ffb 100644
--- a/Lib/test/test_import/__init__.py
+++ b/Lib/test/test_import/__init__.py
@@ -27,18 +27,30 @@
 from unittest import mock
 import _imp
 
-from test.support import os_helper
 from test.support import (
-    STDLIB_DIR, swap_attr, swap_item, cpython_only, is_apple_mobile, is_emscripten,
-    is_wasi, run_in_subinterp, run_in_subinterp_with_config, Py_TRACE_REFS,
-    requires_gil_enabled, Py_GIL_DISABLED, no_rerun)
+    STDLIB_DIR,
+    Py_GIL_DISABLED,
+    Py_TRACE_REFS,
+    cpython_only,
+    force_not_colorized_test_class,
+    is_apple_mobile,
+    is_emscripten,
+    is_wasi,
+    no_rerun,
+    os_helper,
+    requires_gil_enabled,
+    run_in_subinterp,
+    run_in_subinterp_with_config,
+    script_helper,
+    swap_attr,
+    swap_item,
+    threading_helper,
+)
 from test.support.import_helper import (
     forget, make_legacy_pyc, unlink, unload, ready_to_import,
     DirsOnSysPath, CleanImport, import_module)
 from test.support.os_helper import (
     TESTFN, rmtree, temp_umask, TESTFN_UNENCODABLE)
-from test.support import script_helper
-from test.support import threading_helper
 from test.test_importlib.util import uncache
 from types import ModuleType
 try:
@@ -333,6 +345,7 @@ def _from_subinterp(cls, name, interpid, pipe, script_kwargs):
         return cls.parse(text.decode())
 
 
+@force_not_colorized_test_class
 class ImportTests(unittest.TestCase):
 
     def setUp(self):
diff --git a/Lib/test/test_inspect/test_inspect.py b/Lib/test/test_inspect/test_inspect.py
index 1ecf18bf49fa7eb..044873c8d24023a 100644
--- a/Lib/test/test_inspect/test_inspect.py
+++ b/Lib/test/test_inspect/test_inspect.py
@@ -35,12 +35,17 @@
 except ImportError:
     ThreadPoolExecutor = None
 
-from test.support import cpython_only, import_helper
-from test.support import MISSING_C_DOCSTRINGS, ALWAYS_EQ
+from test.support import (
+    ALWAYS_EQ,
+    MISSING_C_DOCSTRINGS,
+    cpython_only,
+    force_not_colorized,
+    has_subprocess_support,
+    import_helper,
+)
 from test.support.import_helper import DirsOnSysPath, ready_to_import
 from test.support.os_helper import TESTFN, temp_cwd
 from test.support.script_helper import assert_python_ok, assert_python_failure, kill_python
-from test.support import has_subprocess_support
 from test import support
 
 from test.test_inspect import inspect_fodder as mod
@@ -890,6 +895,7 @@ def test_getsource_stdlib_decimal(self):
         self.assertEqual(src.splitlines(True), lines)
 
 class TestGetsourceInteractive(unittest.TestCase):
+    @force_not_colorized
     def test_getclasses_interactive(self):
         # bpo-44648: simulate a REPL session;
         # there is no `__file__` in the __main__ module
diff --git a/Lib/test/test_regrtest.py b/Lib/test/test_regrtest.py
index ab46ccbf004a3ac..713ffd74a059842 100644
--- a/Lib/test/test_regrtest.py
+++ b/Lib/test/test_regrtest.py
@@ -26,6 +26,7 @@
 from xml.etree import ElementTree
 
 from test import support
+from test.support import force_not_colorized_test_class
 from test.support import import_helper
 from test.support import os_helper
 from test.libregrtest import cmdline
@@ -792,6 +793,7 @@ def test_finds_expected_number_of_tests(self):
                            f'{", ".join(output.splitlines())}')
 
 
+@force_not_colorized_test_class
 class ProgramsTestCase(BaseTestCase):
     """
     Test various ways to run the Python test suite. Use options close
@@ -905,6 +907,7 @@ def test_pcbuild_rt(self):
         self.run_batch(script, *rt_args, *self.regrtest_args, *self.tests)
 
 
+@force_not_colorized_test_class
 class ArgsTestCase(BaseTestCase):
     """
     Test arguments of the Python test suite.
diff --git a/Lib/test/test_repl.py b/Lib/test/test_repl.py
index e764e60560db234..32b3d5f2b429d4f 100644
--- a/Lib/test/test_repl.py
+++ b/Lib/test/test_repl.py
@@ -9,6 +9,7 @@
 from test import support
 from test.support import (
     cpython_only,
+    force_not_colorized_test_class,
     has_subprocess_support,
     os_helper,
     SuppressCrashReport,
@@ -70,6 +71,7 @@ def run_on_interactive_mode(source):
     return output
 
 
+@force_not_colorized_test_class
 class TestInteractiveInterpreter(unittest.TestCase):
 
     @cpython_only
@@ -273,6 +275,8 @@ def test_asyncio_repl_is_ok(self):
 
         self.assertEqual(exit_code, 0, "".join(output))
 
+
+@force_not_colorized_test_class
 class TestInteractiveModeSyntaxErrors(unittest.TestCase):
 
     def test_interactive_syntax_error_correct_line(self):
diff --git a/Lib/test/test_runpy.py b/Lib/test/test_runpy.py
index b64383f6546f31e..ada78ec8e6b0c75 100644
--- a/Lib/test/test_runpy.py
+++ b/Lib/test/test_runpy.py
@@ -12,8 +12,14 @@
 import textwrap
 import unittest
 import warnings
-from test.support import (infinite_recursion, no_tracing, verbose,
-                          requires_subprocess, requires_resource)
+from test.support import (
+    force_not_colorized_test_class,
+    infinite_recursion,
+    no_tracing,
+    requires_resource,
+    requires_subprocess,
+    verbose,
+)
 from test.support.import_helper import forget, make_legacy_pyc, unload
 from test.support.os_helper import create_empty_file, temp_dir, FakePath
 from test.support.script_helper import make_script, make_zip_script
@@ -758,6 +764,7 @@ def test_encoding(self):
             self.assertEqual(result['s'], "non-ASCII: h\xe9")
 
 
+@force_not_colorized_test_class
 class TestExit(unittest.TestCase):
     STATUS_CONTROL_C_EXIT = 0xC000013A
     EXPECTED_CODE = (
diff --git a/Lib/test/test_tracemalloc.py b/Lib/test/test_tracemalloc.py
index 5755f7697de91ae..ea0716dab61d082 100644
--- a/Lib/test/test_tracemalloc.py
+++ b/Lib/test/test_tracemalloc.py
@@ -981,6 +981,7 @@ def check_sys_xoptions_invalid(self, nframe):
             return
         self.fail(f"unexpected output: {stderr!a}")
 
+    @force_not_colorized
     def test_sys_xoptions_invalid(self):
         for nframe in INVALID_NFRAME:
             with self.subTest(nframe=nframe):
diff --git a/Lib/test/test_unicodedata.py b/Lib/test/test_unicodedata.py
index c7d09a6b460c194..5757a95157cd567 100644
--- a/Lib/test/test_unicodedata.py
+++ b/Lib/test/test_unicodedata.py
@@ -7,12 +7,18 @@
 """
 
 import hashlib
-from http.client import HTTPException
 import sys
 import unicodedata
 import unittest
-from test.support import (open_urlresource, requires_resource, script_helper,
-                          cpython_only, check_disallow_instantiation)
+from http.client import HTTPException
+from test.support import (
+    check_disallow_instantiation,
+    cpython_only,
+    force_not_colorized,
+    open_urlresource,
+    requires_resource,
+    script_helper,
+)
 
 
 class UnicodeMethodsTest(unittest.TestCase):
@@ -277,6 +283,7 @@ def test_disallow_instantiation(self):
         # Ensure that the type disallows instantiation (bpo-43916)
         check_disallow_instantiation(self, unicodedata.UCD)
 
+    @force_not_colorized
     def test_failed_import_during_compiling(self):
         # Issue 4367
         # Decoding \N escapes requires the unicodedata module. If it can't be