diff --git a/homeassistant/components/modbus/validators.py b/homeassistant/components/modbus/validators.py
index 202425bca48..650083dc7e4 100644
--- a/homeassistant/components/modbus/validators.py
+++ b/homeassistant/components/modbus/validators.py
@@ -301,13 +301,14 @@ def check_config(config: dict) -> dict:
 
     def validate_entity(
         hub_name: str,
+        component: str,
         entity: dict,
         minimum_scan_interval: int,
         ent_names: set,
         ent_addr: set,
     ) -> bool:
         """Validate entity."""
-        name = entity[CONF_NAME]
+        name = f"{component}.{entity[CONF_NAME]}"
         addr = f"{hub_name}{entity[CONF_ADDRESS]}"
         scan_interval = entity.get(CONF_SCAN_INTERVAL, DEFAULT_SCAN_INTERVAL)
         if 0 < scan_interval < 5:
@@ -370,7 +371,7 @@ def check_config(config: dict) -> dict:
             continue
         minimum_scan_interval = 9999
         no_entities = True
-        for _component, conf_key in PLATFORMS:
+        for component, conf_key in PLATFORMS:
             if conf_key not in hub:
                 continue
             no_entities = False
@@ -379,6 +380,7 @@ def check_config(config: dict) -> dict:
             while entity_inx < len(entities):
                 if not validate_entity(
                     hub[CONF_NAME],
+                    component,
                     entities[entity_inx],
                     minimum_scan_interval,
                     ent_names,
diff --git a/tests/components/modbus/test_init.py b/tests/components/modbus/test_init.py
index 4de9a439a01..bd590a9e15c 100644
--- a/tests/components/modbus/test_init.py
+++ b/tests/components/modbus/test_init.py
@@ -858,6 +858,30 @@ async def test_duplicate_fan_mode_validator(do_config) -> None:
             ],
             2,
         ),
+        (
+            [
+                {
+                    CONF_NAME: TEST_MODBUS_NAME,
+                    CONF_TYPE: TCP,
+                    CONF_HOST: TEST_MODBUS_HOST,
+                    CONF_PORT: TEST_PORT_TCP,
+                    CONF_TIMEOUT: 3,
+                    CONF_SENSORS: [
+                        {
+                            CONF_NAME: TEST_ENTITY_NAME,
+                            CONF_ADDRESS: 117,
+                            CONF_SLAVE: 0,
+                        },
+                        {
+                            CONF_NAME: TEST_ENTITY_NAME,
+                            CONF_ADDRESS: 1179,
+                            CONF_SLAVE: 0,
+                        },
+                    ],
+                },
+            ],
+            1,
+        ),
     ],
 )
 async def test_duplicate_addresses(do_config, sensor_cnt) -> None:
@@ -867,6 +891,41 @@ async def test_duplicate_addresses(do_config, sensor_cnt) -> None:
     assert len(do_config[use_inx][CONF_SENSORS]) == sensor_cnt
 
 
+@pytest.mark.parametrize(
+    "do_config",
+    [
+        [
+            {
+                CONF_NAME: TEST_MODBUS_NAME,
+                CONF_TYPE: TCP,
+                CONF_HOST: TEST_MODBUS_HOST,
+                CONF_PORT: TEST_PORT_TCP,
+                CONF_TIMEOUT: 3,
+                CONF_SENSORS: [
+                    {
+                        CONF_NAME: TEST_ENTITY_NAME,
+                        CONF_ADDRESS: 117,
+                        CONF_SLAVE: 0,
+                    },
+                ],
+                CONF_BINARY_SENSORS: [
+                    {
+                        CONF_NAME: TEST_ENTITY_NAME + "1",
+                        CONF_ADDRESS: 1179,
+                        CONF_SLAVE: 0,
+                    },
+                ],
+            },
+        ],
+    ],
+)
+async def test_no_duplicate_names(do_config) -> None:
+    """Test duplicate entity validator."""
+    check_config(do_config)
+    assert len(do_config[0][CONF_SENSORS]) == 1
+    assert len(do_config[0][CONF_BINARY_SENSORS]) == 1
+
+
 @pytest.mark.parametrize(
     "do_config",
     [