diff --git a/esphome/components/api/api.proto b/esphome/components/api/api.proto
index 0fa02299ef..32b39b0f73 100644
--- a/esphome/components/api/api.proto
+++ b/esphome/components/api/api.proto
@@ -290,6 +290,7 @@ message ListEntitiesBinarySensorResponse {
   string object_id = 1;
   fixed32 key = 2;
   string name = 3;
+  reserved 4; // Deprecated: was string unique_id
 
   string device_class = 5;
   bool is_status_binary_sensor = 6;
@@ -323,6 +324,7 @@ message ListEntitiesCoverResponse {
   string object_id = 1;
   fixed32 key = 2;
   string name = 3;
+  reserved 4; // Deprecated: was string unique_id
 
   bool assumed_state = 5;
   bool supports_position = 6;
@@ -397,6 +399,7 @@ message ListEntitiesFanResponse {
   string object_id = 1;
   fixed32 key = 2;
   string name = 3;
+  reserved 4; // Deprecated: was string unique_id
 
   bool supports_oscillation = 5;
   bool supports_speed = 6;
@@ -477,6 +480,7 @@ message ListEntitiesLightResponse {
   string object_id = 1;
   fixed32 key = 2;
   string name = 3;
+  reserved 4; // Deprecated: was string unique_id
 
   repeated ColorMode supported_color_modes = 12;
   // next four supports_* are for legacy clients, newer clients should use color modes
@@ -572,6 +576,7 @@ message ListEntitiesSensorResponse {
   string object_id = 1;
   fixed32 key = 2;
   string name = 3;
+  reserved 4; // Deprecated: was string unique_id
 
   string icon = 5;
   string unit_of_measurement = 6;
@@ -610,6 +615,7 @@ message ListEntitiesSwitchResponse {
   string object_id = 1;
   fixed32 key = 2;
   string name = 3;
+  reserved 4; // Deprecated: was string unique_id
 
   string icon = 5;
   bool assumed_state = 6;
@@ -649,6 +655,7 @@ message ListEntitiesTextSensorResponse {
   string object_id = 1;
   fixed32 key = 2;
   string name = 3;
+  reserved 4; // Deprecated: was string unique_id
 
   string icon = 5;
   bool disabled_by_default = 6;
@@ -834,6 +841,7 @@ message ListEntitiesCameraResponse {
   string object_id = 1;
   fixed32 key = 2;
   string name = 3;
+  reserved 4; // Deprecated: was string unique_id
   bool disabled_by_default = 5;
   string icon = 6;
   EntityCategory entity_category = 7;
@@ -915,6 +923,7 @@ message ListEntitiesClimateResponse {
   string object_id = 1;
   fixed32 key = 2;
   string name = 3;
+  reserved 4; // Deprecated: was string unique_id
 
   bool supports_current_temperature = 5;
   bool supports_two_point_target_temperature = 6;
@@ -1013,6 +1022,7 @@ message ListEntitiesNumberResponse {
   string object_id = 1;
   fixed32 key = 2;
   string name = 3;
+  reserved 4; // Deprecated: was string unique_id
 
   string icon = 5;
   float min_value = 6;