diff --git a/docs/en/middleware/uxrce_dds.md b/docs/en/middleware/uxrce_dds.md
index 5ab96699cf..d73e475415 100644
--- a/docs/en/middleware/uxrce_dds.md
+++ b/docs/en/middleware/uxrce_dds.md
@@ -274,6 +274,9 @@ The configuration can be done using the [UXRCE-DDS parameters](../advanced_confi
   - [UXRCE_DDS_SYNCT](../advanced_config/parameter_reference.md#UXRCE_DDS_SYNCT): Bridge time synchronization enable.
     The uXRCE-DDS client module can synchronize the timestamp of the messages exchanged over the bridge.
     This is the default configuration. In certain situations, for example during [simulations](../ros2/user_guide.md#ros-gazebo-and-px4-time-synchronization), this feature may be disabled.
+  - [`UXRCE_DDS_NS_IDX`](../advanced_config/parameter_reference.md#UXRCE_DDS_NS_IDX): Index-based namespace definition
+    Setting this parameter to any value other than `-1` creates a namespace with the prefix `uav_` and the specified value, e.g. `uav_0`, `uav_1`, etc.
+    See [namespace](#customizing-the-namespace) for methods to define richer or arbitrary namespaces.
 
 ::: info
 Many ports are already have a default configuration.
@@ -347,7 +350,7 @@ Therefore,
 
 ## Customizing the Namespace
 
-Custom topic and service namespaces can be applied at build time (changing [dds_topics.yaml](../middleware/dds_topics.md)) or at runtime (which is useful for multi vehicle operations):
+Custom topic and service namespaces can be applied at build time (changing [dds_topics.yaml](../middleware/dds_topics.md)), at runtime, or through a parameter (which is useful for multi vehicle operations):
 
 - One possibility is to use the `-n` option when starting the [uxrce_dds_client](../modules/modules_system.md#uxrce-dds-client) from command line.
   This technique can be used both in simulation and real vehicles.
@@ -376,6 +379,22 @@ will generate topics under the namespaces:
 
 :::
 
+- A simple index-based namespace can be applied by setting the parameter [`UXRCE_DDS_NS_IDX`](../advanced_config/parameter_reference.md#UXRCE_DDS_NS_IDX) to a value between 0 and 9999.
+  This will generate a namespace such as `/uav_0`, `/uav_1`, and so on.
+  This technique is ideal if vehicles must be persistently associated with namespaces because their clients are automatically started through PX4.
+
+::: info
+PX4 parameters cannot carry rich text strings.
+Therefore, you cannot use [`UXRCE_DDS_NS_IDX`](../advanced_config/parameter_reference.md#UXRCE_DDS_NS_IDX) to automatically start a client with an arbitrary message namespace through PX4.
+You can however specify a namespace when starting the client, using the `-n` argument:
+
+```sh
+# In etc/extras.txt on the MicroSD card
+uxrce_dds_client start -n fancy_uav
+```
+
+This can be included in `etc/extras.txt` as part of a custom [System Startup](../concept/system_startup.md).
+
 ## PX4 ROS 2 QoS Settings
 
 PX4 QoS settings for publishers are incompatible with the default QoS settings for ROS 2 subscribers.
diff --git a/src/modules/uxrce_dds_client/module.yaml b/src/modules/uxrce_dds_client/module.yaml
index 773475f1f5..3e9d03fcc9 100644
--- a/src/modules/uxrce_dds_client/module.yaml
+++ b/src/modules/uxrce_dds_client/module.yaml
@@ -129,3 +129,16 @@ parameters:
             reboot_required: true
             default: -1
             unit: s
+
+        UXRCE_DDS_NS_IDX:
+            description:
+                short: Define an index-based message namespace
+                long: |
+                    Defines an index-based namespace for DDS messages, e.g, uav_0, uav_1, up to uav_9999
+                    A value less than zero leaves the namespace empty
+            type: int32
+            min: -1
+            max: 9999
+            category: System
+            reboot_required: true
+            default: -1
diff --git a/src/modules/uxrce_dds_client/uxrce_dds_client.cpp b/src/modules/uxrce_dds_client/uxrce_dds_client.cpp
index d8beb4f609..d5f2b57042 100644
--- a/src/modules/uxrce_dds_client/uxrce_dds_client.cpp
+++ b/src/modules/uxrce_dds_client/uxrce_dds_client.cpp
@@ -49,6 +49,7 @@
 #include <stdlib.h>
 #include <unistd.h>
 
+static constexpr char NAMESPACE_PREFIX[] = "uav_";
 #define PARTICIPANT_XML_SIZE 512
 static constexpr uint8_t TIMESYNC_MAX_TIMEOUTS = 10;
 
@@ -1028,6 +1029,23 @@ UxrceddsClient *UxrceddsClient::instantiate(int argc, char *argv[])
 		}
 	}
 
+	if (client_namespace == nullptr) {
+		int32_t ns_idx = -1;
+		param_get(param_find("UXRCE_DDS_NS_IDX"), &ns_idx);
+
+		if (ns_idx > -1) {
+			if (ns_idx < 10000) {
+				// Allocate buffer for prefix + '\0' + 4 digits
+				static char client_namespace_buf[sizeof(NAMESPACE_PREFIX) + 4];
+				snprintf(client_namespace_buf, sizeof client_namespace_buf, "%s%u", NAMESPACE_PREFIX, (uint16_t)ns_idx);
+				client_namespace = client_namespace_buf;
+
+			} else {
+				PX4_WARN("namespace index must be between 0 and 9999 inclusive; ignoring index-based namespace");
+			}
+		}
+	}
+
 #if defined(UXRCE_DDS_CLIENT_UDP)
 
 	if (port[0] == '\0') {
@@ -1092,7 +1110,7 @@ $ uxrce_dds_client start -t udp -h 127.0.0.1 -p 15555
 	PRINT_MODULE_USAGE_PARAM_INT('b', 0, 0, 3000000, "Baudrate (can also be p:<param_name>)", true);
 	PRINT_MODULE_USAGE_PARAM_STRING('h', nullptr, "<IP>", "Agent IP. If not provided, defaults to UXRCE_DDS_AG_IP", true);
 	PRINT_MODULE_USAGE_PARAM_INT('p', -1, 0, 65535, "Agent listening port. If not provided, defaults to UXRCE_DDS_PRT", true);
-	PRINT_MODULE_USAGE_PARAM_STRING('n', nullptr, nullptr, "Client DDS namespace", true);
+	PRINT_MODULE_USAGE_PARAM_STRING('n', nullptr, nullptr, "Client DDS namespace. If not provided but UXRCE_DDS_NS_IDX is between 0 and 9999 inclusive, then uav_ + UXRCE_DDS_NS_IDX will be used", true);
 	PRINT_MODULE_USAGE_DEFAULT_COMMANDS();
 
 	return 0;