diff --git a/ansible/roles/rabbitmq/defaults/main.yml b/ansible/roles/rabbitmq/defaults/main.yml
index 6707be96fe..321beac21f 100644
--- a/ansible/roles/rabbitmq/defaults/main.yml
+++ b/ansible/roles/rabbitmq/defaults/main.yml
@@ -95,6 +95,10 @@ rabbitmq_remove_ha_all_policy: false
 # More details see:
 # https://www.rabbitmq.com/ha.html#promoting-unsynchronised-mirrors
 rabbitmq_ha_promote_on_shutdown:
+# If no replica count is specified, replicates across all nodes with definition
+# "ha-mode":"all". Otherwise, uses
+# "ha-mode":"exactly","ha-params":{{ rabbitmq_ha_replica_count | int }}
+rabbitmq_ha_replica_count:
 
 ####################
 # Plugins
diff --git a/ansible/roles/rabbitmq/templates/definitions.json.j2 b/ansible/roles/rabbitmq/templates/definitions.json.j2
index 8135adbf10..47bf48c6c0 100644
--- a/ansible/roles/rabbitmq/templates/definitions.json.j2
+++ b/ansible/roles/rabbitmq/templates/definitions.json.j2
@@ -18,8 +18,8 @@
   ],
 {% if om_enable_rabbitmq_high_availability | bool %}
   "policies":[
-    {"vhost": "/", "name": "ha-all", "pattern": "^(?!(amq\\.)|(.*_fanout_)|(reply_)).*", "apply-to": "all", "definition": {"ha-mode":"all"{% if rabbitmq_ha_promote_on_shutdown is not none %},"ha-promote-on-shutdown":"{{ rabbitmq_ha_promote_on_shutdown }}"{% endif %}}, "priority":0}{% if project_name == 'outward_rabbitmq' %},
-    {"vhost": "{{ murano_agent_rabbitmq_vhost }}", "name": "ha-all", "pattern": "^(?!(amq\\.)|(.*_fanout_)|(reply_)).*", "apply-to": "all", "definition": {"ha-mode":"all"{% if rabbitmq_ha_promote_on_shutdown is not none %},"ha-promote-on-shutdown":"{{ rabbitmq_ha_promote_on_shutdown }}"{% endif %}}, "priority":0}
+    {"vhost": "/", "name": "ha-all", "pattern": "^(?!(amq\\.)|(.*_fanout_)|(reply_)).*", "apply-to": "all", "definition": {"ha-mode":{% if rabbitmq_ha_replica_count is not none %}"exactly","ha-params":{{ rabbitmq_ha_replica_count | int }}{% else %}"all"{% endif %}{% if rabbitmq_ha_promote_on_shutdown is not none %},"ha-promote-on-shutdown":"{{ rabbitmq_ha_promote_on_shutdown }}"{% endif %}}, "priority":0}{% if project_name == 'outward_rabbitmq' %},
+    {"vhost": "{{ murano_agent_rabbitmq_vhost }}", "name": "ha-all", "pattern": "^(?!(amq\\.)|(.*_fanout_)|(reply_)).*", "apply-to": "all", "definition": {"ha-mode":{% if rabbitmq_ha_replica_count is not none %}"exactly","ha-params":{{ rabbitmq_ha_replica_count | int }}{% else %}"all"{% endif %}{% if rabbitmq_ha_promote_on_shutdown is not none %},"ha-promote-on-shutdown":"{{ rabbitmq_ha_promote_on_shutdown }}"{% endif %}}, "priority":0}
     {% endif %}
   ]
 {% elif rabbitmq_remove_ha_all_policy | bool %}
diff --git a/releasenotes/notes/rabbitmq-ha-flag-to-change-replication-factor-321c2f9e08e7d179.yaml b/releasenotes/notes/rabbitmq-ha-flag-to-change-replication-factor-321c2f9e08e7d179.yaml
new file mode 100644
index 0000000000..53c05998e6
--- /dev/null
+++ b/releasenotes/notes/rabbitmq-ha-flag-to-change-replication-factor-321c2f9e08e7d179.yaml
@@ -0,0 +1,9 @@
+---
+features:
+  - |
+    The config option `rabbitmq_ha_replica_count` is added, to allow for
+    changing the replication factor of mirrored queues in RabbitMQ. While the
+    flag is unset, the queues are mirrored across all nodes using
+    "ha-mode":"all". Note that this only has an effect if the flag
+    ` om_enable_rabbitmq_high_availability` is set to `True`, as otherwise
+    queues are not mirrored.
diff --git a/tools/validate-all-file.py b/tools/validate-all-file.py
index 0bad735d81..12653a676c 100755
--- a/tools/validate-all-file.py
+++ b/tools/validate-all-file.py
@@ -128,6 +128,7 @@ def check_json_j2():
             'kolla_internal_fqdn': '',
             'octavia_provider_drivers': '',
             'storage_interface': 'storage_interface',
+            'rabbitmq_ha_replica_count': 2,
         }
         data = template.render(**context)
         json.loads(data)