diff --git a/nova/api/openstack/compute/services.py b/nova/api/openstack/compute/services.py
index cf6f94eaafb6..b5aa42cdd56c 100644
--- a/nova/api/openstack/compute/services.py
+++ b/nova/api/openstack/compute/services.py
@@ -245,9 +245,14 @@ class ServiceController(wsgi.Controller):
                                                                   ag.id,
                                                                   service.host)
                 # remove the corresponding resource provider record from
-                # placement for this compute node
-                self.placementclient.delete_resource_provider(
-                    context, service.compute_node, cascade=True)
+                # placement for the compute nodes managed by this service;
+                # remember that an ironic compute service can manage multiple
+                # nodes
+                compute_nodes = objects.ComputeNodeList.get_all_by_host(
+                    context, service.host)
+                for compute_node in compute_nodes:
+                    self.placementclient.delete_resource_provider(
+                        context, compute_node, cascade=True)
                 # remove the host_mapping of this host.
                 try:
                     hm = objects.HostMapping.get_by_host(context, service.host)
diff --git a/nova/tests/unit/api/openstack/compute/test_services.py b/nova/tests/unit/api/openstack/compute/test_services.py
index a2fbc11f8888..ba8d6054c941 100644
--- a/nova/tests/unit/api/openstack/compute/test_services.py
+++ b/nova/tests/unit/api/openstack/compute/test_services.py
@@ -712,25 +712,33 @@ class ServicesTestV21(test.TestCase):
         """Tests that we are still able to successfully delete a nova-compute
         service even if the HostMapping is not found.
         """
+        @mock.patch('nova.objects.ComputeNodeList.get_all_by_host',
+                    return_value=objects.ComputeNodeList(objects=[
+                        objects.ComputeNode(host='host1',
+                                            hypervisor_hostname='node1'),
+                        objects.ComputeNode(host='host1',
+                                            hypervisor_hostname='node2')]))
         @mock.patch.object(self.controller.host_api, 'service_get_by_id',
                            return_value=objects.Service(
-                               host='host1', binary='nova-compute',
-                               compute_node=objects.ComputeNode()))
+                               host='host1', binary='nova-compute'))
         @mock.patch.object(self.controller.aggregate_api,
                            'get_aggregates_by_host',
                            return_value=objects.AggregateList())
         @mock.patch.object(self.controller.placementclient,
                            'delete_resource_provider')
         def _test(delete_resource_provider,
-                  get_aggregates_by_host, service_get_by_id):
+                  get_aggregates_by_host, service_get_by_id,
+                  cn_get_all_by_host):
             self.controller.delete(self.req, 2)
             ctxt = self.req.environ['nova.context']
             service_get_by_id.assert_called_once_with(ctxt, 2)
             get_instances.assert_called_once_with(ctxt, 'host1')
             get_aggregates_by_host.assert_called_once_with(ctxt, 'host1')
-            delete_resource_provider.assert_called_once_with(
-                ctxt, service_get_by_id.return_value.compute_node,
-                cascade=True)
+            self.assertEqual(2, delete_resource_provider.call_count)
+            nodes = cn_get_all_by_host.return_value
+            delete_resource_provider.assert_has_calls([
+                mock.call(ctxt, node, cascade=True) for node in nodes
+            ], any_order=True)
             get_hm.assert_called_once_with(ctxt, 'host1')
             service_delete.assert_called_once_with()
         _test()
diff --git a/releasenotes/notes/bug-1811726-multi-node-delete-2ba17f02c6171fbb.yaml b/releasenotes/notes/bug-1811726-multi-node-delete-2ba17f02c6171fbb.yaml
new file mode 100644
index 000000000000..66fe6a5f9945
--- /dev/null
+++ b/releasenotes/notes/bug-1811726-multi-node-delete-2ba17f02c6171fbb.yaml
@@ -0,0 +1,10 @@
+---
+fixes:
+  - |
+    `Bug 1811726`_ is fixed by deleting the resource provider (in placement)
+    associated with each compute node record managed by a ``nova-compute``
+    service when that service is deleted via the
+    ``DELETE /os-services/{service_id}`` API. This is particularly important
+    for compute services managing ironic baremetal nodes.
+
+    .. _Bug 1811726: https://bugs.launchpad.net/nova/+bug/1811726