diff --git a/src/packaging/_elffile.py b/src/packaging/_elffile.py
index 497b06452..15312765a 100644
--- a/src/packaging/_elffile.py
+++ b/src/packaging/_elffile.py
@@ -9,6 +9,8 @@
 
 from __future__ import annotations
 
+__lazy_modules__ = ["os", "struct", "typing"]
+
 import enum
 import os
 import struct
diff --git a/src/packaging/_manylinux.py b/src/packaging/_manylinux.py
index 0e79e8a88..08583356a 100644
--- a/src/packaging/_manylinux.py
+++ b/src/packaging/_manylinux.py
@@ -1,5 +1,7 @@
 from __future__ import annotations
 
+__lazy_modules__ = [f"{__spec__.parent}._elffile", "os", "re", "sys", "warnings"]
+
 import collections
 import contextlib
 import functools
diff --git a/src/packaging/_musllinux.py b/src/packaging/_musllinux.py
index 4e8116a79..6c85d1cf8 100644
--- a/src/packaging/_musllinux.py
+++ b/src/packaging/_musllinux.py
@@ -6,6 +6,8 @@
 
 from __future__ import annotations
 
+__lazy_modules__ = [f"{__spec__.parent}._elffile", "subprocess"]
+
 import functools
 import re
 import subprocess
diff --git a/src/packaging/_parser.py b/src/packaging/_parser.py
index f6c1f5cd2..02b96b868 100644
--- a/src/packaging/_parser.py
+++ b/src/packaging/_parser.py
@@ -6,6 +6,8 @@
 
 from __future__ import annotations
 
+__lazy_modules__ = ["ast", f"{__spec__.parent}._tokenizer"]
+
 import ast
 from typing import List, Literal, NamedTuple, Sequence, Tuple, Union
 
diff --git a/src/packaging/_tokenizer.py b/src/packaging/_tokenizer.py
index 5ab891ccb..15e906cff 100644
--- a/src/packaging/_tokenizer.py
+++ b/src/packaging/_tokenizer.py
@@ -1,5 +1,7 @@
 from __future__ import annotations
 
+__lazy_modules__ = ["contextlib", "typing"]
+
 import contextlib
 import re
 from dataclasses import dataclass
diff --git a/src/packaging/dependency_groups.py b/src/packaging/dependency_groups.py
index 413e5cb4b..e5e3a94ec 100644
--- a/src/packaging/dependency_groups.py
+++ b/src/packaging/dependency_groups.py
@@ -1,5 +1,12 @@
 from __future__ import annotations
 
+__lazy_modules__ = [
+    "collections",
+    "collections.abc",
+    f"{__spec__.parent}.errors",
+    f"{__spec__.parent}.requirements",
+]
+
 import re
 from collections.abc import Mapping, Sequence
 
diff --git a/src/packaging/direct_url.py b/src/packaging/direct_url.py
index 5d1c56ca9..980058425 100644
--- a/src/packaging/direct_url.py
+++ b/src/packaging/direct_url.py
@@ -1,5 +1,7 @@
 from __future__ import annotations
 
+__lazy_modules__ = ["collections", "collections.abc", "urllib", "urllib.parse"]
+
 import dataclasses
 import re
 import urllib.parse
diff --git a/src/packaging/errors.py b/src/packaging/errors.py
index d1d47cf6c..1f60876b6 100644
--- a/src/packaging/errors.py
+++ b/src/packaging/errors.py
@@ -1,5 +1,7 @@
 from __future__ import annotations
 
+__lazy_modules__ = ["builtins", "contextlib", "typing"]
+
 import contextlib
 import dataclasses
 import sys
diff --git a/src/packaging/licenses/__init__.py b/src/packaging/licenses/__init__.py
index cf90173a7..a213d1b35 100644
--- a/src/packaging/licenses/__init__.py
+++ b/src/packaging/licenses/__init__.py
@@ -31,6 +31,8 @@
 #######################################################################################
 from __future__ import annotations
 
+__lazy_modules__ = [f"{__spec__.parent}._spdx"]
+
 import re
 from typing import NewType, cast
 
diff --git a/src/packaging/markers.py b/src/packaging/markers.py
index 7e178858a..6c27f8992 100644
--- a/src/packaging/markers.py
+++ b/src/packaging/markers.py
@@ -4,6 +4,16 @@
 
 from __future__ import annotations
 
+__lazy_modules__ = [
+    f"{__spec__.parent}._parser",
+    f"{__spec__.parent}._tokenizer",
+    f"{__spec__.parent}.specifiers",
+    f"{__spec__.parent}.utils",
+    "os",
+    "platform",
+    "sys",
+]
+
 import operator
 import os
 import platform
diff --git a/src/packaging/metadata.py b/src/packaging/metadata.py
index 967a932f9..af69cf6d0 100644
--- a/src/packaging/metadata.py
+++ b/src/packaging/metadata.py
@@ -1,5 +1,7 @@
 from __future__ import annotations
 
+__lazy_modules__ = [f"{__spec__.parent}.errors", "keyword", "pathlib"]
+
 import email.header
 import email.message
 import email.parser
diff --git a/src/packaging/pylock.py b/src/packaging/pylock.py
index 96aa35c6d..65d6163f2 100644
--- a/src/packaging/pylock.py
+++ b/src/packaging/pylock.py
@@ -1,5 +1,17 @@
 from __future__ import annotations
 
+__lazy_modules__ = [
+    "collections",
+    "collections.abc",
+    "datetime",
+    f"{__spec__.parent}.markers",
+    f"{__spec__.parent}.specifiers",
+    f"{__spec__.parent}.utils",
+    f"{__spec__.parent}.version",
+    "urllib",
+    "urllib.parse",
+]
+
 import dataclasses
 import logging
 import re
diff --git a/src/packaging/requirements.py b/src/packaging/requirements.py
index 18640d438..3421ce002 100644
--- a/src/packaging/requirements.py
+++ b/src/packaging/requirements.py
@@ -3,6 +3,15 @@
 # for complete details.
 from __future__ import annotations
 
+__lazy_modules__ = [
+    f"{__spec__.parent}._parser",
+    f"{__spec__.parent}._tokenizer",
+    f"{__spec__.parent}.markers",
+    f"{__spec__.parent}.specifiers",
+    f"{__spec__.parent}.utils",
+    "typing",
+]
+
 from typing import Iterator
 
 from ._parser import parse_requirement as _parse_requirement
diff --git a/src/packaging/specifiers.py b/src/packaging/specifiers.py
index 0d55cad5f..70b212b79 100644
--- a/src/packaging/specifiers.py
+++ b/src/packaging/specifiers.py
@@ -10,6 +10,8 @@
 
 from __future__ import annotations
 
+__lazy_modules__ = [f"{__spec__.parent}.utils", "itertools"]
+
 import abc
 import itertools
 import re
diff --git a/src/packaging/tags.py b/src/packaging/tags.py
index e3cc602ec..3b6dbfb67 100644
--- a/src/packaging/tags.py
+++ b/src/packaging/tags.py
@@ -4,6 +4,16 @@
 
 from __future__ import annotations
 
+__lazy_modules__ = [
+    "importlib",
+    "importlib.machinery",
+    "platform",
+    "re",
+    "subprocess",
+    "sys",
+    "sysconfig",
+]
+
 import logging
 import platform
 import re
diff --git a/src/packaging/utils.py b/src/packaging/utils.py
index 9d66be888..a36d659bb 100644
--- a/src/packaging/utils.py
+++ b/src/packaging/utils.py
@@ -4,6 +4,8 @@
 
 from __future__ import annotations
 
+__lazy_modules__ = [f"{__spec__.parent}.tags", f"{__spec__.parent}.version"]
+
 import re
 from typing import NewType, Tuple, Union, cast
 
diff --git a/src/packaging/version.py b/src/packaging/version.py
index af000eea6..d5390ade4 100644
--- a/src/packaging/version.py
+++ b/src/packaging/version.py
@@ -9,6 +9,8 @@
 
 from __future__ import annotations
 
+__lazy_modules__ = ["functools", "warnings"]
+
 import re
 import sys
 import typing