diff --git a/src/humanize/__init__.py b/src/humanize/__init__.py
index 6fb9959..4f54bc4 100644
--- a/src/humanize/__init__.py
+++ b/src/humanize/__init__.py
@@ -2,6 +2,15 @@
 
 from __future__ import annotations
 
+__lazy_modules__ = {
+    "humanize._version",
+    "humanize.filesize",
+    "humanize.i18n",
+    "humanize.lists",
+    "humanize.number",
+    "humanize.time",
+}
+
 from humanize.filesize import naturalsize
 from humanize.i18n import activate, deactivate, decimal_separator, thousands_separator
 from humanize.lists import natural_list
diff --git a/src/humanize/filesize.py b/src/humanize/filesize.py
index 315261a..fb675fd 100644
--- a/src/humanize/filesize.py
+++ b/src/humanize/filesize.py
@@ -2,6 +2,8 @@
 
 from __future__ import annotations
 
+__lazy_modules__ = {"humanize.i18n", "math"}
+
 from math import log
 
 from humanize.i18n import _gettext as _
diff --git a/src/humanize/number.py b/src/humanize/number.py
index 9224a10..2fb22c6 100644
--- a/src/humanize/number.py
+++ b/src/humanize/number.py
@@ -2,6 +2,8 @@
 
 from __future__ import annotations
 
+__lazy_modules__ = {"bisect"}
+
 import bisect
 
 from .i18n import _gettext as _
diff --git a/src/humanize/time.py b/src/humanize/time.py
index 8651a98..4a07d52 100644
--- a/src/humanize/time.py
+++ b/src/humanize/time.py
@@ -5,6 +5,8 @@
 
 from __future__ import annotations
 
+__lazy_modules__ = {"humanize.i18n", "humanize.number"}
+
 from enum import Enum
 from functools import total_ordering