diff --git a/news/10074.trivial.rst b/news/10074.trivial.rst
new file mode 100644
index 00000000000..2f844d92171
--- /dev/null
+++ b/news/10074.trivial.rst
@@ -0,0 +1 @@
+Fixed all the annotations from ``pip/_internal/distributions``.
diff --git a/src/pip/_internal/distributions/__init__.py b/src/pip/_internal/distributions/__init__.py
index a222f248f34..9a89a838b9a 100644
--- a/src/pip/_internal/distributions/__init__.py
+++ b/src/pip/_internal/distributions/__init__.py
@@ -4,8 +4,9 @@
 from pip._internal.req.req_install import InstallRequirement
 
 
-def make_distribution_for_install_requirement(install_req):
-    # type: (InstallRequirement) -> AbstractDistribution
+def make_distribution_for_install_requirement(
+    install_req: InstallRequirement,
+) -> AbstractDistribution:
     """Returns a Distribution for the given InstallRequirement"""
     # Editable requirements will always be source distributions. They use the
     # legacy logic until we create a modern standard for them.
diff --git a/src/pip/_internal/distributions/base.py b/src/pip/_internal/distributions/base.py
index 78ee91e76f1..fbdd5e41154 100644
--- a/src/pip/_internal/distributions/base.py
+++ b/src/pip/_internal/distributions/base.py
@@ -23,17 +23,16 @@ class AbstractDistribution(metaclass=abc.ABCMeta):
        above metadata.
     """
 
-    def __init__(self, req):
-        # type: (InstallRequirement) -> None
+    def __init__(self, req: InstallRequirement) -> None:
         super().__init__()
         self.req = req
 
     @abc.abstractmethod
-    def get_pkg_resources_distribution(self):
-        # type: () -> Optional[Distribution]
+    def get_pkg_resources_distribution(self) -> Optional[Distribution]:
         raise NotImplementedError()
 
     @abc.abstractmethod
-    def prepare_distribution_metadata(self, finder, build_isolation):
-        # type: (PackageFinder, bool) -> None
+    def prepare_distribution_metadata(
+        self, finder: PackageFinder, build_isolation: bool
+    ) -> None:
         raise NotImplementedError()
diff --git a/src/pip/_internal/distributions/installed.py b/src/pip/_internal/distributions/installed.py
index b19dfacb4db..0d452e27f35 100644
--- a/src/pip/_internal/distributions/installed.py
+++ b/src/pip/_internal/distributions/installed.py
@@ -13,10 +13,10 @@ class InstalledDistribution(AbstractDistribution):
     been computed.
     """
 
-    def get_pkg_resources_distribution(self):
-        # type: () -> Optional[Distribution]
+    def get_pkg_resources_distribution(self) -> Optional[Distribution]:
         return self.req.satisfied_by
 
-    def prepare_distribution_metadata(self, finder, build_isolation):
-        # type: (PackageFinder, bool) -> None
+    def prepare_distribution_metadata(
+        self, finder: PackageFinder, build_isolation: bool
+    ) -> None:
         pass
diff --git a/src/pip/_internal/distributions/sdist.py b/src/pip/_internal/distributions/sdist.py
index c873a9f10e1..596b516a5b6 100644
--- a/src/pip/_internal/distributions/sdist.py
+++ b/src/pip/_internal/distributions/sdist.py
@@ -19,12 +19,12 @@ class SourceDistribution(AbstractDistribution):
     generated, either using PEP 517 or using the legacy `setup.py egg_info`.
     """
 
-    def get_pkg_resources_distribution(self):
-        # type: () -> Distribution
+    def get_pkg_resources_distribution(self) -> Distribution:
         return self.req.get_dist()
 
-    def prepare_distribution_metadata(self, finder, build_isolation):
-        # type: (PackageFinder, bool) -> None
+    def prepare_distribution_metadata(
+        self, finder: PackageFinder, build_isolation: bool
+    ) -> None:
         # Load pyproject.toml, to determine whether PEP 517 is to be used
         self.req.load_pyproject_toml()
 
@@ -35,10 +35,10 @@ def prepare_distribution_metadata(self, finder, build_isolation):
 
         self.req.prepare_metadata()
 
-    def _setup_isolation(self, finder):
-        # type: (PackageFinder) -> None
-        def _raise_conflicts(conflicting_with, conflicting_reqs):
-            # type: (str, Set[Tuple[str, str]]) -> None
+    def _setup_isolation(self, finder: PackageFinder) -> None:
+        def _raise_conflicts(
+            conflicting_with: str, conflicting_reqs: Set[Tuple[str, str]]
+        ) -> None:
             format_string = (
                 "Some build dependencies for {requirement} "
                 "conflict with {conflicting_with}: {description}."
diff --git a/src/pip/_internal/distributions/wheel.py b/src/pip/_internal/distributions/wheel.py
index d0384797b46..00a70b02dc3 100644
--- a/src/pip/_internal/distributions/wheel.py
+++ b/src/pip/_internal/distributions/wheel.py
@@ -13,8 +13,7 @@ class WheelDistribution(AbstractDistribution):
     This does not need any preparation as wheels can be directly unpacked.
     """
 
-    def get_pkg_resources_distribution(self):
-        # type: () -> Distribution
+    def get_pkg_resources_distribution(self) -> Distribution:
         """Loads the metadata from the wheel file into memory and returns a
         Distribution that uses it, not relying on the wheel file or
         requirement.
@@ -29,6 +28,7 @@ def get_pkg_resources_distribution(self):
                 z, self.req.name, self.req.local_file_path
             )
 
-    def prepare_distribution_metadata(self, finder, build_isolation):
-        # type: (PackageFinder, bool) -> None
+    def prepare_distribution_metadata(
+        self, finder: PackageFinder, build_isolation: bool
+    ) -> None:
         pass