diff --git a/src/ucp/api/ucp.h b/src/ucp/api/ucp.h
index 4f9e6834d79..d1b78c3f6cb 100644
--- a/src/ucp/api/ucp.h
+++ b/src/ucp/api/ucp.h
@@ -268,7 +268,8 @@ enum ucp_ep_params_field {
     /**< Connection request field */
     UCP_EP_PARAM_FIELD_CONN_REQUEST      = UCS_BIT(6),
     UCP_EP_PARAM_FIELD_NAME              = UCS_BIT(7), /**< Endpoint name */
-    UCP_EP_PARAM_FIELD_LOCAL_SOCK_ADDR   = UCS_BIT(8)  /**< Local socket Address */
+    UCP_EP_PARAM_FIELD_LOCAL_SOCK_ADDR   = UCS_BIT(8), /**< Local socket Address */
+    UCP_EP_PARAM_FIELD_TRAFFIC_CLASS     = UCS_BIT(9)  /**< Traffic class */
 };
 
 
diff --git a/src/ucp/api/ucp_def.h b/src/ucp/api/ucp_def.h
index 95b138b313d..1592219d6f9 100644
--- a/src/ucp/api/ucp_def.h
+++ b/src/ucp/api/ucp_def.h
@@ -788,6 +788,23 @@ typedef struct ucp_ep_params {
      */
     ucs_sock_addr_t         local_sockaddr;
 
+    /**
+     * Traffic class for this endpoint, as a full 8-bit Type of Service value:
+     * a 6-bit Differentiated Services Code Point (DSCP) followed by 2 ECN
+     * bits. On InfiniBand it is used as the GRH Traffic Class; on RoCEv2 its
+     * upper 6 bits are used as the DSCP field of the IP header. It overrides
+     * the transport's default traffic class for this endpoint only, using the
+     * same format.
+     *
+     * Currently implemented by the RC transport over mlx5 devices with DEVX
+     * enabled, including the GGA and GDAKI transports which are based on it.
+     * Transports which do not support it, such as DC, ignore this value and
+     * keep using their default traffic class.
+     *
+     * This setting is optional. To enable it, the corresponding @ref
+     * UCP_EP_PARAM_FIELD_TRAFFIC_CLASS bit in the field mask must be set.
+     */
+    uint8_t                 traffic_class;
 } ucp_ep_params_t;
 
 
diff --git a/src/uct/api/v2/uct_v2.h b/src/uct/api/v2/uct_v2.h
index 982dc190d25..5e38f3b73ac 100644
--- a/src/uct/api/v2/uct_v2.h
+++ b/src/uct/api/v2/uct_v2.h
@@ -374,7 +374,10 @@ typedef enum {
     UCT_EP_CONNECT_TO_EP_PARAM_FIELD_DEVICE_ADDR_LENGTH = UCS_BIT(0),
 
     /** Endpoint address length */
-    UCT_EP_CONNECT_TO_EP_PARAM_FIELD_EP_ADDR_LENGTH     = UCS_BIT(1)
+    UCT_EP_CONNECT_TO_EP_PARAM_FIELD_EP_ADDR_LENGTH     = UCS_BIT(1),
+
+    /** Traffic class */
+    UCT_EP_CONNECT_TO_EP_PARAM_FIELD_TRAFFIC_CLASS      = UCS_BIT(2)
 } uct_ep_connect_to_ep_param_field_t;
 
 
@@ -729,6 +732,25 @@ typedef struct uct_ep_connect_to_ep_params {
      * default minimal length according to the address buffer contents.
      */
     size_t                        ep_addr_length;
+
+    /**
+     * Traffic class for this endpoint, as a full 8-bit Type of Service value:
+     * a 6-bit Differentiated Services Code Point (DSCP) followed by 2 ECN
+     * bits. On InfiniBand it is used as the GRH Traffic Class; on RoCEv2 its
+     * upper 6 bits are used as the DSCP field of the IP header. It overrides
+     * the interface's default traffic class for this endpoint only, using the
+     * same format.
+     *
+     * Currently implemented by the RC transport over mlx5 devices with DEVX
+     * enabled, including the GGA and GDAKI transports which are based on it.
+     * Transports which do not support it, such as DC, ignore this value and
+     * keep using their default traffic class.
+     *
+     * This setting is optional. To enable it, the corresponding @ref
+     * UCT_EP_CONNECT_TO_EP_PARAM_FIELD_TRAFFIC_CLASS bit in the field mask
+     * must be set.
+     */
+    uint8_t                       traffic_class;
 } uct_ep_connect_to_ep_params_t;