diff --git a/changelogs/fragments/51406-aci_aaa_user-description.yaml b/changelogs/fragments/51406-aci_aaa_user-description.yaml
new file mode 100644
index 00000000000..61404728912
--- /dev/null
+++ b/changelogs/fragments/51406-aci_aaa_user-description.yaml
@@ -0,0 +1,2 @@
+bugfixes:
+- aci_aaa_user - Fix setting user description (https://github.com/ansible/ansible/issues/51406)
diff --git a/lib/ansible/modules/network/aci/aci_aaa_user.py b/lib/ansible/modules/network/aci/aci_aaa_user.py
index 21160cf5cfb..0ddb54304fe 100644
--- a/lib/ansible/modules/network/aci/aci_aaa_user.py
+++ b/lib/ansible/modules/network/aci/aci_aaa_user.py
@@ -331,6 +331,7 @@ def main():
             class_config=dict(
                 accountStatus=enabled,
                 clearPwdHistory=clear_password_history,
+                descr=description,
                 email=email,
                 expiration=expiration,
                 expires=expires,
diff --git a/test/integration/targets/aci_aaa_user/tasks/main.yml b/test/integration/targets/aci_aaa_user/tasks/main.yml
index a707b25af84..46b2af238ef 100644
--- a/test/integration/targets/aci_aaa_user/tasks/main.yml
+++ b/test/integration/targets/aci_aaa_user/tasks/main.yml
@@ -66,8 +66,10 @@
     that:
     - cm_add_user is changed
     - nm_add_user is changed
+    - nm_add_user.current.0.aaaUser.attributes.descr == 'Ansible test user'
     - cm_add_user_again is not changed
     - nm_add_user_again is not changed
+    - nm_add_user_again.current.0.aaaUser.attributes.descr == 'Ansible test user'
 
 
 # MODIFY USER
@@ -107,8 +109,10 @@
     that:
     - cm_modify_user is changed
     - nm_modify_user is changed
+    - nm_modify_user.current.0.aaaUser.attributes.descr == 'Ansible test user for integration tests'
     - cm_modify_user_again is not changed
     - nm_modify_user_again is not changed
+    - nm_modify_user_again.current.0.aaaUser.attributes.descr == 'Ansible test user for integration tests'
 
 
 # QUERY ALL USERS
@@ -157,6 +161,12 @@
     - cm_query_user is not changed
     - nm_query_user is not changed
     - cm_query_user == nm_query_user
+    - nm_query_user.current.0.aaaUser.attributes.accountStatus == 'active'
+    - nm_query_user.current.0.aaaUser.attributes.descr == 'Ansible test user for integration tests'
+    - nm_query_user.current.0.aaaUser.attributes.email == 'aci-ansible@ansible.lan'
+    - nm_query_user.current.0.aaaUser.attributes.expiration == '2123-12-12T00:00:00.000+00:00'
+    - nm_query_user.current.0.aaaUser.attributes.expires == 'yes'
+    - nm_query_user.current.0.aaaUser.attributes.phone == '2-345-555-678'
 
 
 # REMOVE USER