diff --git a/nova/api/openstack/placement/handlers/resource_provider.py b/nova/api/openstack/placement/handlers/resource_provider.py
index f108bd5a6ec9..0312fc16cb42 100644
--- a/nova/api/openstack/placement/handlers/resource_provider.py
+++ b/nova/api/openstack/placement/handlers/resource_provider.py
@@ -174,7 +174,9 @@ def list_resource_providers(req):
     want_version = req.environ[microversion.MICROVERSION_ENVIRON]
 
     schema = rp_schema.GET_RPS_SCHEMA_1_0
-    if want_version.matches((1, 14)):
+    if want_version.matches((1, 18)):
+        schema = rp_schema.GET_RPS_SCHEMA_1_18
+    elif want_version.matches((1, 14)):
         schema = rp_schema.GET_RPS_SCHEMA_1_14
     elif want_version.matches((1, 4)):
         schema = rp_schema.GET_RPS_SCHEMA_1_4
@@ -184,7 +186,8 @@ def list_resource_providers(req):
     util.validate_query_params(req, schema)
 
     filters = {}
-    for attr in ['uuid', 'name', 'member_of', 'in_tree']:
+    qpkeys = ('uuid', 'name', 'member_of', 'in_tree', 'resources', 'required')
+    for attr in qpkeys:
         if attr in req.GET:
             value = req.GET[attr]
             # special case member_of to always make its value a
@@ -203,10 +206,11 @@ def list_resource_providers(req):
                         raise webob.exc.HTTPBadRequest(
                             _('Invalid uuid value: %(uuid)s') %
                             {'uuid': aggr_uuid})
+            elif attr == 'resources':
+                value = util.normalize_resources_qs_param(value)
+            elif attr == 'required':
+                value = util.normalize_traits_qs_param(value)
             filters[attr] = value
-    if 'resources' in req.GET:
-        resources = util.normalize_resources_qs_param(req.GET['resources'])
-        filters['resources'] = resources
     try:
         resource_providers = rp_obj.ResourceProviderList.get_all_by_filters(
             context, filters)
@@ -214,6 +218,10 @@ def list_resource_providers(req):
         raise webob.exc.HTTPBadRequest(
             _('Invalid resource class in resources parameter: %(error)s') %
             {'error': exc})
+    except exception.TraitNotFound as exc:
+        raise webob.exc.HTTPBadRequest(
+            _('Invalid trait(s) in "required" parameter: %(error)s') %
+            {'error': exc})
 
     response = req.response
     output, last_modified = _serialize_providers(
diff --git a/nova/api/openstack/placement/microversion.py b/nova/api/openstack/placement/microversion.py
index 000dfcb809f3..83d18e2c8ee9 100644
--- a/nova/api/openstack/placement/microversion.py
+++ b/nova/api/openstack/placement/microversion.py
@@ -60,6 +60,7 @@ VERSIONS = [
     '1.16',  # Add 'limit' query parameter to GET /allocation_candidates
     '1.17',  # Add 'required' query parameter to GET /allocation_candidates and
              # return traits in the provider summary.
+    '1.18',  # Support ?required=<traits> queryparam on GET /resource_providers
 ]
 
 
diff --git a/nova/api/openstack/placement/rest_api_version_history.rst b/nova/api/openstack/placement/rest_api_version_history.rst
index ebb8cc295394..b6be104d0e49 100644
--- a/nova/api/openstack/placement/rest_api_version_history.rst
+++ b/nova/api/openstack/placement/rest_api_version_history.rst
@@ -158,7 +158,7 @@ for resources.
 
 The ``/resource_providers/{rp_uuid}/allocations`` endpoint has been available
 since version 1.0, but was not listed in the ``links`` section of the
-``GET /resource_providers`` response.  The link is included as of version 1.11.
+``GET /resource_providers`` response. The link is included as of version 1.11.
 
 1.12 PUT dict format to /allocations/{consumer_uuid}
 ----------------------------------------------------
@@ -221,3 +221,15 @@ value, `N`, which limits the maximum number of candidates returned.
 Add the `required` parameter to the `GET /allocation_candidates` API. It
 accepts a list of traits separated by `,`. The provider summary in the response
 will include the attached traits also.
+
+1.18 Support ?required=<traits> queryparam on GET /resource_providers
+---------------------------------------------------------------------
+
+Add support for the `required` query parameter to the `GET /resource_providers`
+API. It accepts a comma-separated list of string trait names. When specified,
+the API results will be filtered to include only resource providers marked with
+all the specified traits. This is in addition to (logical AND) any filtering
+based on other query parameters.
+
+Trait names which are empty, do not exist, or are otherwise invalid will result
+in a 400 error.
diff --git a/nova/api/openstack/placement/schemas/resource_provider.py b/nova/api/openstack/placement/schemas/resource_provider.py
index 579791b40adc..7ca43ef69ac9 100644
--- a/nova/api/openstack/placement/schemas/resource_provider.py
+++ b/nova/api/openstack/placement/schemas/resource_provider.py
@@ -94,3 +94,13 @@ GET_RPS_SCHEMA_1_14['properties']['in_tree'] = {
     "type": "string",
     "format": "uuid",
 }
+
+# Microversion 1.18 adds support for the `required` query parameter to the
+# `GET /resource_providers` API. It accepts a comma-separated list of string
+# trait names. When specified, the API results will be filtered to include only
+# resource providers marked with all the specified traits. This is in addition
+# to (logical AND) any filtering based on other query parameters.
+GET_RPS_SCHEMA_1_18 = copy.deepcopy(GET_RPS_SCHEMA_1_14)
+GET_RPS_SCHEMA_1_18['properties']['required'] = {
+    "type": "string",
+}
diff --git a/nova/objects/resource_provider.py b/nova/objects/resource_provider.py
index 7209ddad5560..a412022e710d 100644
--- a/nova/objects/resource_provider.py
+++ b/nova/objects/resource_provider.py
@@ -1396,6 +1396,7 @@ class ResourceProviderList(base.ObjectListBase, base.NovaObject):
         #          'MEMORY_MB': 1024
         #      },
         #      'in_tree': <uuid>,
+        #      'required': [<trait_name>, ...]
         #  }
         if not filters:
             filters = {}
@@ -1406,6 +1407,7 @@ class ResourceProviderList(base.ObjectListBase, base.NovaObject):
         name = filters.pop('name', None)
         uuid = filters.pop('uuid', None)
         member_of = filters.pop('member_of', [])
+        required = filters.pop('required', [])
 
         resources = filters.pop('resources', {})
         # NOTE(sbauza): We want to key the dict by the resource class IDs
@@ -1473,6 +1475,19 @@ class ResourceProviderList(base.ObjectListBase, base.NovaObject):
                 [resource_provider_id]).select_from(join_statement)
             query = query.where(rp.c.id.in_(rps_in_aggregates))
 
+        # If 'required' has values, add a filter to limit results to providers
+        # possessing *all* of the listed traits.
+        if required:
+            trait_map = _trait_ids_from_names(context, required)
+            if len(trait_map) != len(required):
+                missing = required - set(trait_map)
+                raise exception.TraitNotFound(names=', '.join(missing))
+            rp_ids = _get_provider_ids_having_all_traits(context, trait_map)
+            if not rp_ids:
+                # If no providers have the required traits, we're done
+                return []
+            query = query.where(rp.c.id.in_(rp_ids))
+
         if not resources:
             # Returns quickly the list in case we don't need to check the
             # resource usage
@@ -1575,6 +1590,7 @@ class ResourceProviderList(base.ObjectListBase, base.NovaObject):
         :type filters: dict
         """
         _ensure_rc_cache(context)
+        _ensure_trait_sync(context)
         resource_providers = cls._get_all_by_filters_from_db(context, filters)
         return base.obj_make_list(context, cls(context),
                                   ResourceProvider, resource_providers)
diff --git a/nova/tests/functional/api/openstack/placement/gabbits/microversion.yaml b/nova/tests/functional/api/openstack/placement/gabbits/microversion.yaml
index 2a40d4f5cc17..7bafe881e47f 100644
--- a/nova/tests/functional/api/openstack/placement/gabbits/microversion.yaml
+++ b/nova/tests/functional/api/openstack/placement/gabbits/microversion.yaml
@@ -39,13 +39,13 @@ tests:
   response_json_paths:
       $.errors[0].title: Not Acceptable
 
-- name: latest microversion is 1.17
+- name: latest microversion is 1.18
   GET: /
   request_headers:
       openstack-api-version: placement latest
   response_headers:
       vary: /OpenStack-API-Version/
-      openstack-api-version: placement 1.17
+      openstack-api-version: placement 1.18
 
 - name: other accept header bad version
   GET: /
diff --git a/nova/tests/functional/api/openstack/placement/gabbits/resource-provider.yaml b/nova/tests/functional/api/openstack/placement/gabbits/resource-provider.yaml
index 33776f0de7b7..12305169460b 100644
--- a/nova/tests/functional/api/openstack/placement/gabbits/resource-provider.yaml
+++ b/nova/tests/functional/api/openstack/placement/gabbits/resource-provider.yaml
@@ -392,6 +392,107 @@ tests:
       $.resource_providers.`len`: 1
       $.resource_providers[?uuid="$ENVIRON['ALT_PARENT_PROVIDER_UUID']"].root_provider_uuid: $ENVIRON['ALT_PARENT_PROVIDER_UUID']
 
+- name: filter providers by traits none of them have
+  GET: /resource_providers?required=HW_CPU_X86_SGX,HW_CPU_X86_SHA
+  response_json_paths:
+      $.resource_providers.`len`: 0
+
+- name: add traits to a provider
+  PUT: /resource_providers/$ENVIRON['RP_UUID']/traits
+  request_headers:
+    content-type: application/json
+  data:
+      resource_provider_generation: 0
+      traits: ['HW_CPU_X86_SGX', 'STORAGE_DISK_SSD']
+
+- name: add traits to another provider
+  PUT: /resource_providers/$ENVIRON['ALT_PARENT_PROVIDER_UUID']/traits
+  request_headers:
+    content-type: application/json
+  data:
+      resource_provider_generation: 0
+      traits: ['MISC_SHARES_VIA_AGGREGATE', 'STORAGE_DISK_SSD']
+
+- name: filter providers with multiple traits where no provider has all of them
+  GET: /resource_providers?required=HW_CPU_X86_SGX,MISC_SHARES_VIA_AGGREGATE
+  response_json_paths:
+      $.resource_providers.`len`: 0
+
+- name: filter providers with a trait some of them have
+  GET: /resource_providers?required=STORAGE_DISK_SSD
+  response_json_paths:
+      $.resource_providers.`len`: 2
+      # Don't really care about the root UUID - just validating that the providers present are the ones we expected
+      $.resource_providers[?uuid="$ENVIRON['ALT_PARENT_PROVIDER_UUID']"].root_provider_uuid: $ENVIRON['ALT_PARENT_PROVIDER_UUID']
+      $.resource_providers[?uuid="$ENVIRON['RP_UUID']"].root_provider_uuid: $ENVIRON['PARENT_PROVIDER_UUID']
+
+- name: list providers with 'required' parameter filters cumulatively with in_tree
+  GET: /resource_providers?required=STORAGE_DISK_SSD&in_tree=$ENVIRON['RP_UUID']
+  response_json_paths:
+      $.resource_providers.`len`: 1
+      # Only RP_UUID satisfies both the tree and trait constraint
+      $.resource_providers[?uuid="$ENVIRON['RP_UUID']"].root_provider_uuid: $ENVIRON['PARENT_PROVIDER_UUID']
+
+- name: create some inventory
+  PUT: /resource_providers/$ENVIRON['ALT_PARENT_PROVIDER_UUID']/inventories
+  request_headers:
+      content-type: application/json
+  data:
+      resource_provider_generation: 1
+      inventories:
+        IPV4_ADDRESS:
+          total: 253
+        DISK_GB:
+          total: 1024
+  status: 200
+  response_json_paths:
+      $.resource_provider_generation: 2
+      $.inventories.IPV4_ADDRESS.total: 253
+      $.inventories.IPV4_ADDRESS.reserved: 0
+      $.inventories.DISK_GB.total: 1024
+      $.inventories.DISK_GB.allocation_ratio: 1.0
+
+- name: list providers with 'required' parameter filters cumulatively with resources
+  GET: /resource_providers?required=STORAGE_DISK_SSD&resources=IPV4_ADDRESS:10
+  response_json_paths:
+      $.resource_providers.`len`: 1
+      # Only ALT_PARENT_PROVIDER_UUID satisfies both the tree and trait constraint
+      $.resource_providers[?uuid="$ENVIRON['ALT_PARENT_PROVIDER_UUID']"].root_provider_uuid: $ENVIRON['ALT_PARENT_PROVIDER_UUID']
+
+- name: invalid 'required' parameter - blank
+  GET: /resource_providers?required=
+  status: 400
+  response_strings:
+      - "Invalid query string parameters: Expected 'required' parameter value of the form: HW_CPU_X86_VMX,CUSTOM_MAGIC."
+  response_json_paths:
+      $.errors[0].title: Bad Request
+
+- name: invalid 'required' parameter - contains an empty trait name
+  GET: /resource_providers?required=STORAGE_DISK_SSD,,MISC_SHARES_VIA_AGGREGATE
+  status: 400
+  response_strings:
+      - "Invalid query string parameters: Expected 'required' parameter value of the form: HW_CPU_X86_VMX,CUSTOM_MAGIC."
+  response_json_paths:
+      $.errors[0].title: Bad Request
+
+- name: invalid 'required' parameter - contains a nonexistent trait
+  GET: /resource_providers?required=STORAGE_DISK_SSD,BOGUS_TRAIT,MISC_SHARES_VIA_AGGREGATE
+  status: 400
+  response_strings:
+      - "No such trait(s): BOGUS_TRAIT."
+  response_json_paths:
+      $.errors[0].title: Bad Request
+
+- name: schema validation fails with 'required' parameter on old microversion
+  request_headers:
+      openstack-api-version: placement 1.17
+  GET: /resource_providers?required=HW_CPU_X86_SGX,MISC_SHARES_VIA_AGGREGATE
+  status: 400
+  response_strings:
+      - Additional properties are not allowed
+  response_json_paths:
+      $.errors[0].title: Bad Request
+
 - name: fail trying to re-parent to a different provider
   PUT: /resource_providers/$ENVIRON['RP_UUID']
   request_headers:
diff --git a/placement-api-ref/source/parameters.yaml b/placement-api-ref/source/parameters.yaml
index 6c1e87bdd99a..5a42e69213d7 100644
--- a/placement-api-ref/source/parameters.yaml
+++ b/placement-api-ref/source/parameters.yaml
@@ -85,6 +85,14 @@ resource_provider_name_query:
   required: false
   description: >
     The name of a resource provider to filter the list.
+resource_provider_required_query:
+  type: string
+  in: query
+  required: false
+  description: >
+    A comma-delimited list of string trait names. Results will be filtered to
+    include only resource providers having all the specified traits.
+  min_version: 1.18
 resource_provider_tree_query:
   type: string
   in: query
diff --git a/placement-api-ref/source/resource_providers.inc b/placement-api-ref/source/resource_providers.inc
index 20a1cf7ce69f..60bae1f5106f 100644
--- a/placement-api-ref/source/resource_providers.inc
+++ b/placement-api-ref/source/resource_providers.inc
@@ -28,6 +28,7 @@ of all filters are merged with a boolean `AND`.
   - uuid: resource_provider_uuid_query
   - member_of: member_of
   - resources: resources_query
+  - required: resource_provider_required_query
   - in_tree: resource_provider_tree_query
 
 Response
diff --git a/releasenotes/notes/placement-required-traits-on-list-resource-providers-fab11cdb36cd3502.yaml b/releasenotes/notes/placement-required-traits-on-list-resource-providers-fab11cdb36cd3502.yaml
new file mode 100644
index 000000000000..1fa3ecd37d93
--- /dev/null
+++ b/releasenotes/notes/placement-required-traits-on-list-resource-providers-fab11cdb36cd3502.yaml
@@ -0,0 +1,12 @@
+---
+features:
+  - |
+    Placement API microversion 1.18 adds support for the `required` query
+    parameter to the `GET /resource_providers` API. It accepts a
+    comma-separated list of string trait names. When specified, the API
+    results will be filtered to include only resource providers marked with
+    all the specified traits. This is in addition to (logical AND) any
+    filtering based on other query parameters.
+
+    Trait names which are empty, do not exist, or are otherwise invalid will
+    result in a 400 error.