diff --git a/pkg_resources/__init__.py b/pkg_resources/__init__.py
index f64c0b18fe..be39007579 100644
--- a/pkg_resources/__init__.py
+++ b/pkg_resources/__init__.py
@@ -1094,7 +1094,15 @@ def _added_new(self, dist):
         for callback in self.callbacks:
             callback(dist)
 
-    def __getstate__(self):
+    def __getstate__(
+        self,
+    ) -> tuple[
+        list[str],
+        dict[str | None, list[str]],
+        dict[str, Distribution],
+        dict[str, str],
+        list[Callable[[Distribution], object]],
+    ]:
         return (
             self.entries[:],
             self.entry_keys.copy(),
@@ -1103,7 +1111,7 @@ def __getstate__(self):
             self.callbacks[:],
         )
 
-    def __setstate__(self, e_k_b_n_c):
+    def __setstate__(self, e_k_b_n_c) -> None:
         entries, keys, by_key, normalized_to_canonical_keys, callbacks = e_k_b_n_c
         self.entries = entries[:]
         self.entry_keys = keys.copy()
@@ -3171,7 +3179,7 @@ def __str__(self) -> str:
         version = version or "[unknown version]"
         return "%s %s" % (self.project_name, version)
 
-    def __getattr__(self, attr):
+    def __getattr__(self, attr: str):
         """Delegate all unrecognized public attributes to .metadata provider"""
         if attr.startswith('_'):
             raise AttributeError(attr)
diff --git a/setuptools/command/build_py.py b/setuptools/command/build_py.py
index e6d9656f10..584d2c15ac 100644
--- a/setuptools/command/build_py.py
+++ b/setuptools/command/build_py.py
@@ -81,7 +81,7 @@ def run(self):
         # output files are.
         self.byte_compile(orig.build_py.get_outputs(self, include_bytecode=False))
 
-    def __getattr__(self, attr):
+    def __getattr__(self, attr: str):
         "lazily compute data files"
         if attr == 'data_files':
             self.data_files = self._get_data_files()
diff --git a/setuptools/command/develop.py b/setuptools/command/develop.py
index 1938434b3a..4ecbd5a1e8 100644
--- a/setuptools/command/develop.py
+++ b/setuptools/command/develop.py
@@ -188,7 +188,7 @@ class VersionlessRequirement:
     def __init__(self, dist):
         self.__dist = dist
 
-    def __getattr__(self, name):
+    def __getattr__(self, name: str):
         return getattr(self.__dist, name)
 
     def as_requirement(self):
diff --git a/setuptools/command/test.py b/setuptools/command/test.py
index 38e1164c27..341b11a20e 100644
--- a/setuptools/command/test.py
+++ b/setuptools/command/test.py
@@ -1,8 +1,11 @@
+from __future__ import annotations
+
 from setuptools import Command
 from setuptools.warnings import SetuptoolsDeprecationWarning
 
 
-def __getattr__(name):
+# Would restrict to Literal["test"], but mypy doesn't support it: https://github.com/python/mypy/issues/8203
+def __getattr__(name: str) -> type[_test]:
     if name == 'test':
         SetuptoolsDeprecationWarning.emit(
             "The test command is disabled and references to it are deprecated.",
diff --git a/setuptools/config/expand.py b/setuptools/config/expand.py
index dfee1c5d37..d12cc1d8b0 100644
--- a/setuptools/config/expand.py
+++ b/setuptools/config/expand.py
@@ -61,7 +61,7 @@ def _find_assignments(self) -> Iterator[tuple[ast.AST, ast.AST]]:
             elif isinstance(statement, ast.AnnAssign) and statement.value:
                 yield (statement.target, statement.value)
 
-    def __getattr__(self, attr):
+    def __getattr__(self, attr: str):
         """Attempt to load an attribute "statically", via :func:`ast.literal_eval`."""
         try:
             return next(
diff --git a/setuptools/config/setupcfg.py b/setuptools/config/setupcfg.py
index 072b787062..54469f74a3 100644
--- a/setuptools/config/setupcfg.py
+++ b/setuptools/config/setupcfg.py
@@ -280,7 +280,7 @@ def parsers(self):
             '%s must provide .parsers property' % self.__class__.__name__
         )
 
-    def __setitem__(self, option_name, value):
+    def __setitem__(self, option_name, value) -> None:
         target_obj = self.target_obj
 
         # Translate alias into real name.
diff --git a/setuptools/tests/test_build_meta.py b/setuptools/tests/test_build_meta.py
index c34f711662..cfd4cd453a 100644
--- a/setuptools/tests/test_build_meta.py
+++ b/setuptools/tests/test_build_meta.py
@@ -8,6 +8,7 @@
 import tarfile
 from concurrent import futures
 from pathlib import Path
+from typing import Any, Callable
 from zipfile import ZipFile
 
 import pytest
@@ -44,7 +45,7 @@ def __init__(self, *args, **kwargs):
         super().__init__(*args, **kwargs)
         self.pool = futures.ProcessPoolExecutor(max_workers=1)
 
-    def __getattr__(self, name):
+    def __getattr__(self, name: str) -> Callable[..., Any]:
         """Handles arbitrary function invocations on the build backend."""
 
         def method(*args, **kw):