diff --git a/changelogs/fragments/os-module_defaults-group.yml b/changelogs/fragments/os-module_defaults-group.yml
new file mode 100644
index 00000000000..c823ea679f1
--- /dev/null
+++ b/changelogs/fragments/os-module_defaults-group.yml
@@ -0,0 +1,5 @@
+---
+minor_changes:
+- An `os` module_defaults group has been added to simplify parameters for
+  multiple OpenStack tasks.  This group includes all OpenStack modules with
+  an `os_`-prefixed module name.
diff --git a/docs/docsite/rst/user_guide/playbooks_module_defaults.rst b/docs/docsite/rst/user_guide/playbooks_module_defaults.rst
index 4e815f72095..9250311e5aa 100644
--- a/docs/docsite/rst/user_guide/playbooks_module_defaults.rst
+++ b/docs/docsite/rst/user_guide/playbooks_module_defaults.rst
@@ -96,6 +96,8 @@ it easier to author playbooks making heavy use of API-based modules such as clou
 +-------+---------------------------+-----------------+
 | k8s   | Kubernetes                | 2.8             |
 +-------+---------------------------+-----------------+
+| os    | OpenStack                 | 2.8             |
++-------+---------------------------+-----------------+
 
 Use the groups with `module_defaults` by prefixing the group name with `group/` - e.g. `group/aws`
 
diff --git a/lib/ansible/config/module_defaults.yml b/lib/ansible/config/module_defaults.yml
index 325d8a9f0a6..bbedb2e4be0 100644
--- a/lib/ansible/config/module_defaults.yml
+++ b/lib/ansible/config/module_defaults.yml
@@ -616,3 +616,109 @@ groupings:
   - k8s
   kubevirt_vm:
   - k8s
+  os_auth:
+  - os
+  os_client_config:
+  - os
+  os_coe_cluster:
+  - os
+  os_coe_cluster_template:
+  - os
+  os_flavor_facts:
+  - os
+  os_floating_ip:
+  - os
+  os_group:
+  - os
+  os_image:
+  - os
+  os_image_facts:
+  - os
+  os_ironic:
+  - os
+  os_ironic_inspect:
+  - os
+  os_ironic_node:
+  - os
+  os_keypair:
+  - os
+  os_keystone_domain:
+  - os
+  os_keystone_domain_facts:
+  - os
+  os_keystone_endpoint:
+  - os
+  os_keystone_role:
+  - os
+  os_keystone_service:
+  - os
+  os_listener:
+  - os
+  os_loadbalancer:
+  - os
+  os_member:
+  - os
+  os_network:
+  - os
+  os_networks_facts:
+  - os
+  os_nova_flavor:
+  - os
+  os_nova_host_aggregate:
+  - os
+  os_object:
+  - os
+  os_pool:
+  - os
+  os_port:
+  - os
+  os_port_facts:
+  - os
+  os_project:
+  - os
+  os_project_access:
+  - os
+  os_project_facts:
+  - os
+  os_quota:
+  - os
+  os_recordset:
+  - os
+  os_router:
+  - os
+  os_security_group:
+  - os
+  os_security_group_rule:
+  - os
+  os_server:
+  - os
+  os_server_action:
+  - os
+  os_server_facts:
+  - os
+  os_server_group:
+  - os
+  os_server_metadata:
+  - os
+  os_server_volume:
+  - os
+  os_stack:
+  - os
+  os_subnet:
+  - os
+  os_subnets_facts:
+  - os
+  os_user:
+  - os
+  os_user_facts:
+  - os
+  os_user_group:
+  - os
+  os_user_role:
+  - os
+  os_volume:
+  - os
+  os_volume_snapshot:
+  - os
+  os_zone:
+  - os