diff --git a/lib/ansible/module_utils/network/aci/aci.py b/lib/ansible/module_utils/network/aci/aci.py
index 2a4a24083b..503df6831f 100644
--- a/lib/ansible/module_utils/network/aci/aci.py
+++ b/lib/ansible/module_utils/network/aci/aci.py
@@ -186,6 +186,14 @@ class ACIModule(object):
         elif self.params['password'] is not None:
             self.module.warn('When doing ACI signatured-based authentication, a password is not required')
 
+    def iso8601_format(self, dt):
+        ''' Return an ACI-compatible ISO8601 formatted time: 2123-12-12T00:00:00.000+00:00 '''
+        try:
+            return dt.isoformat(timespec='milliseconds')
+        except:
+            tz = dt.strftime('%z')
+            return '%s.%03d%s:%s' % (dt.strftime('%Y-%m-%dT%H:%M:%S'), dt.microsecond / 1000, tz[:3], tz[3:])
+
     def define_protocol(self):
         ''' Set protocol based on use_ssl parameter '''
 
@@ -315,7 +323,6 @@ class ACIModule(object):
     def query(self, path):
         ''' Perform a query with no payload '''
 
-        # Ensure method is set
         self.result['path'] = path
 
         if 'port' in self.params and self.params['port'] is not None:
diff --git a/lib/ansible/modules/network/aci/aci_aaa_user.py b/lib/ansible/modules/network/aci/aci_aaa_user.py
new file mode 100644
index 0000000000..16414a96a4
--- /dev/null
+++ b/lib/ansible/modules/network/aci/aci_aaa_user.py
@@ -0,0 +1,256 @@
+#!/usr/bin/python
+# -*- coding: utf-8 -*-
+
+# Copyright: (c) 2018, Dag Wieers (dagwieers) <dag@wieers.com>
+# GNU General Public License v3.0+ (see COPYING or https://www.gnu.org/licenses/gpl-3.0.txt)
+
+from __future__ import absolute_import, division, print_function
+__metaclass__ = type
+
+ANSIBLE_METADATA = {'metadata_version': '1.1',
+                    'status': ['preview'],
+                    'supported_by': 'community'}
+
+DOCUMENTATION = r'''
+---
+module: aci_aaa_user
+short_description: Manage AAA users (aaa:User)
+description:
+- Manage AAA users.
+- More information from the internal APIC class I(aaa:User) at
+  U(https://developer.cisco.com/docs/apic-mim-ref/).
+author:
+- Dag Wieers (@dagwieers)
+notes:
+- This module is not idempotent when C(aaa_password) is being used
+  (even if that password was already set identically). This
+  appears to be an inconsistency wrt. the idempotent nature
+  of the APIC REST API.
+requirements:
+  - python-dateutil
+version_added: '2.5'
+options:
+  aaa_password:
+    description:
+    - The password of the locally-authenticated user.
+  aaa_password_lifetime:
+    description:
+    - The lifetime of the locally-authenticated user password.
+  aaa_password_update_required:
+    description:
+    - Whether this account needs password update.
+    type: bool
+  aaa_user:
+    description:
+    - The name of the locally-authenticated user user to add.
+    aliases: [ name, user ]
+  clear_password_history:
+    description:
+    - Whether to clear the password history of a locally-authenticated user.
+    type: bool
+  description:
+    description:
+    - Description for the AAA user.
+    aliases: [ descr ]
+  email:
+    description:
+    - The email address of the locally-authenticated user.
+  enabled:
+    description:
+    - The status of the locally-authenticated user account.
+    type: bool
+  expiration:
+    description:
+    - The expiration date of the locally-authenticated user account.
+  expires:
+    description:
+    - Whether to enable an expiration date for the locally-authenticated user account.
+    type: bool
+  first_name:
+    description:
+    - The first name of the locally-authenticated user.
+  last_name:
+    description:
+    - The last name of the locally-authenticated user.
+  phone:
+    description:
+    - The phone number of the locally-authenticated user.
+  state:
+    description:
+    - Use C(present) or C(absent) for adding or removing.
+    - Use C(query) for listing an object or multiple objects.
+    choices: [ absent, present, query ]
+    default: present
+extends_documentation_fragment: aci
+'''
+
+EXAMPLES = r'''
+- name: Add a user
+  aci_aaa_user:
+    host: apic
+    username: admin
+    password: SomeSecretPassword
+    aaa_user: dag
+    aaa_password: AnotherSecretPassword
+    expiration: never
+    expires: no
+    email: dag@wieers.com
+    phone: 1-234-555-678
+    first_name: Dag
+    last_name: Wieers
+    state: present
+
+- name: Remove a user
+  aci_aaa_user:
+    host: apic
+    username: admin
+    password: SomeSecretPassword
+    aaa_user: dag
+    state: absent
+
+- name: Query a user
+  aci_aaa_user:
+    host: apic
+    username: admin
+    password: SomeSecretPassword
+    aaa_user: dag
+    state: query
+
+- name: Query all users
+  aci_aaa_user:
+    host: apic
+    username: admin
+    password: SomeSecretPassword
+    state: query
+'''
+
+RETURN = r''' # '''
+
+from ansible.module_utils.network.aci.aci import ACIModule, aci_argument_spec
+from ansible.module_utils.basic import AnsibleModule
+
+try:
+    from dateutil.tz import tzutc
+    import dateutil.parser
+    HAS_DATEUTIL = True
+except ImportError:
+    HAS_DATEUTIL = False
+
+
+def main():
+    argument_spec = aci_argument_spec()
+    argument_spec.update(
+        aaa_password=dict(type='str', no_log=True),
+        aaa_password_lifetime=dict(type='int'),
+        aaa_password_update_required=dict(type='bool'),
+        aaa_user=dict(type='str', required=True, aliases=['name']),
+        clear_password_history=dict(type='bool'),
+        description=dict(type='str', aliases=['descr']),
+        email=dict(type='str'),
+        enabled=dict(type='bool'),
+        expiration=dict(type='str'),
+        expires=dict(type='bool'),
+        first_name=dict(type='str'),
+        last_name=dict(type='str'),
+        phone=dict(type='str'),
+        state=dict(type='str', default='present', choices=['absent', 'present', 'query']),
+    )
+
+    module = AnsibleModule(
+        argument_spec=argument_spec,
+        supports_check_mode=True,
+        required_if=[
+            ['state', 'absent', ['aaa_user']],
+            ['state', 'present', ['aaa_user']],
+            ['expires', True, ['expiration']],
+        ],
+    )
+
+    if not HAS_DATEUTIL:
+        module.fail_json(msg='dateutil required for this module')
+
+    aaa_password = module.params['aaa_password']
+    aaa_password_lifetime = module.params['aaa_password_lifetime']
+    aaa_password_update_required = module.params['aaa_password_update_required']
+    aaa_user = module.params['aaa_user']
+    clear_password_history = module.params['clear_password_history']
+    description = module.params['description']
+    email = module.params['email']
+    enabled = module.params['enabled']
+    first_name = module.params['first_name']
+    last_name = module.params['last_name']
+    phone = module.params['phone']
+    state = module.params['state']
+
+    aci = ACIModule(module)
+
+    if module.params['enabled'] is True:
+        enabled = 'active'
+    elif module.params['enabled'] is False:
+        enabled = 'inactive'
+    else:
+        enabled = None
+
+    expiration = module.params['expiration']
+    if expiration is not None and expiration != 'never':
+        try:
+            expiration = aci.iso8601_format(dateutil.parser.parse(expiration).replace(tzinfo=tzutc()))
+        except Exception as e:
+            module.fail_json(msg="Failed to parse date format '%s', %s" % (module.params['expiration'], e))
+
+    expires = module.params['expires']
+    if expires is True:
+        expires = 'yes'
+    elif expires is False:
+        expires = 'no'
+
+    aaa_password_update_required = module.params['aaa_password_update_required']
+    if aaa_password_update_required is True:
+        aaa_password_update_required = 'yes'
+    elif aaa_password_update_required is False:
+        aaa_password_update_required = 'no'
+
+    aci.construct_url(
+        root_class=dict(
+            aci_class='aaaUser',
+            aci_rn='userext/user-{0}'.format(aaa_user),
+            filter_target='eq(aaaUser.name, "{0}")'.format(aaa_user),
+            module_object=aaa_user,
+        ),
+    )
+    aci.get_existing()
+
+    if state == 'present':
+        # Filter out module params with null values
+        aci.payload(
+            aci_class='aaaUser',
+            class_config=dict(
+                accountStatus=enabled,
+                clearPwdHistory=clear_password_history,
+                email=email,
+                expiration=expiration,
+                expires=expires,
+                firstName=first_name,
+                lastName=last_name,
+                name=aaa_user,
+                phone=phone,
+                pwd=aaa_password,
+                pwdLifeTime=aaa_password_lifetime,
+                pwdUpdateRequired=aaa_password_update_required,
+            ),
+        )
+
+        # Generate config diff which will be used as POST request body
+        aci.get_diff(aci_class='aaaUser')
+
+        # Submit changes if module not in check_mode and the proposed is different than existing
+        aci.post_config()
+
+    elif state == 'absent':
+        aci.delete_config()
+
+    module.exit_json(**aci.result)
+
+
+if __name__ == "__main__":
+    main()
diff --git a/test/integration/targets/aci_aaa_user/aliases b/test/integration/targets/aci_aaa_user/aliases
new file mode 100644
index 0000000000..e69de29bb2
diff --git a/test/integration/targets/aci_aaa_user/tasks/main.yml b/test/integration/targets/aci_aaa_user/tasks/main.yml
new file mode 100644
index 0000000000..b6d2242018
--- /dev/null
+++ b/test/integration/targets/aci_aaa_user/tasks/main.yml
@@ -0,0 +1,175 @@
+# Test code for the ACI modules
+# Copyright: (c) 2017, Dag Wieers (dagwieers) <dag@wieers.com>
+#
+# GNU General Public License v3.0+ (see COPYING or https://www.gnu.org/licenses/gpl-3.0.txt)
+
+- name: Test that we have an ACI APIC host, ACI username and ACI password
+  fail:
+    msg: 'Please define the following variables: aci_hostname, aci_username and aci_password.'
+  when: aci_hostname is not defined or aci_username is not defined or aci_password is not defined
+
+
+# CLEAN ENVIRONMENT
+- name: Remove any pre-existing user
+  aci_aaa_user: &user_absent
+    host: '{{ aci_hostname }}'
+    username: '{{ aci_username }}'
+    password: '{{ aci_password }}'
+    validate_certs: '{{ aci_validate_certs | default(false) }}'
+    use_ssl: '{{ aci_use_ssl | default(true) }}'
+    use_proxy: '{{ aci_use_proxy | default(true) }}'
+    aaa_user: ansible
+    state: absent
+
+
+# ADD USER
+- name: Add user (check_mode)
+  aci_aaa_user: &user_present
+    host: '{{ aci_hostname }}'
+    username: '{{ aci_username }}'
+    password: '{{ aci_password }}'
+    validate_certs: '{{ aci_validate_certs | default(false) }}'
+    use_ssl: '{{ aci_use_ssl | default(true) }}'
+    use_proxy: '{{ aci_use_proxy | default(true) }}'
+    aaa_user: ansible
+    description: Ansible test user
+    email: ansible@ansible.lan
+    enabled: yes
+    expiration: never
+    expires: no
+    first_name: Test
+    last_name: User
+    phone: 1-234-555-678
+  check_mode: yes
+  register: cm_add_user
+
+# NOTE: Setting password is not idempotent, see #35544
+- name: Add user (normal mode)
+  aci_aaa_user:
+    <<: *user_present
+    aaa_password: 12!Ab:cD!34
+  register: nm_add_user
+
+- name: Add user again (check mode)
+  aci_aaa_user: *user_present
+  check_mode: yes
+  register: cm_add_user_again
+
+- name: Add user again (normal mode)
+  aci_aaa_user: *user_present
+  register: nm_add_user_again
+
+- name: Verify add user
+  assert:
+    that:
+    - cm_add_user.changed == nm_add_user.changed == true
+    - cm_add_user_again.changed == nm_add_user_again.changed == false
+
+
+# MODIFY USER
+- name: Modify user (check_mode)
+  aci_aaa_user: &user_changed
+    host: '{{ aci_hostname }}'
+    username: '{{ aci_username }}'
+    password: '{{ aci_password }}'
+    validate_certs: '{{ aci_validate_certs | default(false) }}'
+    use_ssl: '{{ aci_use_ssl | default(true) }}'
+    use_proxy: '{{ aci_use_proxy | default(true) }}'
+    aaa_user: ansible
+    description: Ansible test user for integration tests
+    email: aci-ansible@ansible.lan
+    expiration: '2123-12-12'
+    expires: yes
+    phone: 2-345-555-678
+  check_mode: yes
+  register: cm_modify_user
+
+- name: Modify user (normal mode)
+  aci_aaa_user: *user_changed
+  register: nm_modify_user
+
+- name: Modify user again (check mode)
+  aci_aaa_user: *user_changed
+  check_mode: yes
+  register: cm_modify_user_again
+
+- name: Modify user again (normal mode)
+  aci_aaa_user: *user_changed
+  register: nm_modify_user_again
+
+- name: Verify modify user
+  assert:
+    that:
+    - cm_modify_user.changed == nm_modify_user.changed == true
+    - cm_modify_user_again.changed == nm_modify_user_again.changed == false
+
+
+# QUERY ALL USERS
+- name: Query all users (check_mode)
+  aci_aaa_user: &user_query
+    host: '{{ aci_hostname }}'
+    username: '{{ aci_username }}'
+    password: '{{ aci_password }}'
+    validate_certs: '{{ aci_validate_certs | default(false) }}'
+    use_ssl: '{{ aci_use_ssl | default(true) }}'
+    use_proxy: '{{ aci_use_proxy | default(true) }}'
+    aaa_user: ansible
+    state: query
+  check_mode: yes
+  register: cm_query_all_users
+
+- name: Query all users (normal mode)
+  aci_aaa_user: *user_query
+  register: nm_query_all_users
+
+- name: Verify query_all_users
+  assert:
+    that:
+    - cm_query_all_users.changed == nm_query_all_users.changed == false
+    # NOTE: Order of users is not stable between calls
+    #- cm_query_all_users == nm_query_all_users
+
+
+# QUERY OUR USER
+- name: Query our user (check_mode)
+  aci_aaa_user:
+    <<: *user_query
+  check_mode: yes
+  register: cm_query_user
+
+- name: Query our user (normal mode)
+  aci_aaa_user:
+    <<: *user_query
+  register: nm_query_user
+
+- name: Verify query_user
+  assert:
+    that:
+    - cm_query_user.changed == nm_query_user.changed == false
+    - cm_query_user == nm_query_user
+
+
+# REMOVE USER
+- name: Remove user (check_mode)
+  aci_aaa_user: *user_absent
+  check_mode: yes
+  register: cm_remove_user
+
+- name: Remove user (normal mode)
+  aci_aaa_user: *user_absent
+  register: nm_remove_user
+
+- name: Remove user again (check_mode)
+  aci_aaa_user: *user_absent
+  check_mode: yes
+  register: cm_remove_user_again
+
+- name: Remove user again (normal mode)
+  aci_aaa_user: *user_absent
+  register: nm_remove_user_again
+
+- name: Verify remove_user
+  assert:
+    that:
+    - cm_remove_user.changed == nm_remove_user.changed == true
+    - cm_remove_user_again.changed == nm_remove_user_again.changed == false