diff --git a/homeassistant/components/mqtt/__init__.py b/homeassistant/components/mqtt/__init__.py
index 8a27ff7d759..54d7dc8feb9 100644
--- a/homeassistant/components/mqtt/__init__.py
+++ b/homeassistant/components/mqtt/__init__.py
@@ -198,6 +198,7 @@ PLATFORM_CONFIG_SCHEMA_BASE = vol.Schema(
         vol.Optional(Platform.FAN.value): cv.ensure_list,
         vol.Optional(Platform.LIGHT.value): cv.ensure_list,
         vol.Optional(Platform.LOCK.value): cv.ensure_list,
+        vol.Optional(Platform.SWITCH.value): cv.ensure_list,
         vol.Optional(Platform.VACUUM.value): cv.ensure_list,
     }
 )
diff --git a/homeassistant/components/mqtt/switch.py b/homeassistant/components/mqtt/switch.py
index db54ae08953..f5f8363eb33 100644
--- a/homeassistant/components/mqtt/switch.py
+++ b/homeassistant/components/mqtt/switch.py
@@ -1,6 +1,7 @@
 """Support for MQTT switches."""
 from __future__ import annotations
 
+import asyncio
 import functools
 
 import voluptuous as vol
@@ -37,8 +38,10 @@ from .debug_info import log_messages
 from .mixins import (
     MQTT_ENTITY_COMMON_SCHEMA,
     MqttEntity,
+    async_get_platform_config_from_yaml,
     async_setup_entry_helper,
     async_setup_platform_helper,
+    warn_for_legacy_schema,
 )
 
 DEFAULT_NAME = "MQTT Switch"
@@ -48,7 +51,7 @@ DEFAULT_OPTIMISTIC = False
 CONF_STATE_ON = "state_on"
 CONF_STATE_OFF = "state_off"
 
-PLATFORM_SCHEMA = mqtt.MQTT_RW_PLATFORM_SCHEMA.extend(
+PLATFORM_SCHEMA_MODERN = mqtt.MQTT_RW_SCHEMA.extend(
     {
         vol.Optional(CONF_NAME, default=DEFAULT_NAME): cv.string,
         vol.Optional(CONF_OPTIMISTIC, default=DEFAULT_OPTIMISTIC): cv.boolean,
@@ -61,7 +64,13 @@ PLATFORM_SCHEMA = mqtt.MQTT_RW_PLATFORM_SCHEMA.extend(
     }
 ).extend(MQTT_ENTITY_COMMON_SCHEMA.schema)
 
-DISCOVERY_SCHEMA = PLATFORM_SCHEMA.extend({}, extra=vol.REMOVE_EXTRA)
+# Configuring MQTT Switches under the switch platform key is deprecated in HA Core 2022.6
+PLATFORM_SCHEMA = vol.All(
+    cv.PLATFORM_SCHEMA.extend(PLATFORM_SCHEMA_MODERN.schema),
+    warn_for_legacy_schema(switch.DOMAIN),
+)
+
+DISCOVERY_SCHEMA = PLATFORM_SCHEMA_MODERN.extend({}, extra=vol.REMOVE_EXTRA)
 
 
 async def async_setup_platform(
@@ -70,7 +79,8 @@ async def async_setup_platform(
     async_add_entities: AddEntitiesCallback,
     discovery_info: DiscoveryInfoType | None = None,
 ) -> None:
-    """Set up MQTT switch through configuration.yaml."""
+    """Set up MQTT switch configured under the fan platform key (deprecated)."""
+    # Deprecated in HA Core 2022.6
     await async_setup_platform_helper(
         hass, switch.DOMAIN, config, async_add_entities, _async_setup_entity
     )
@@ -81,7 +91,17 @@ async def async_setup_entry(
     config_entry: ConfigEntry,
     async_add_entities: AddEntitiesCallback,
 ) -> None:
-    """Set up MQTT switch dynamically through MQTT discovery."""
+    """Set up MQTT switch through configuration.yaml and dynamically through MQTT discovery."""
+    # load and initialize platform config from configuration.yaml
+    await asyncio.gather(
+        *(
+            _async_setup_entity(hass, async_add_entities, config, config_entry)
+            for config in await async_get_platform_config_from_yaml(
+                hass, switch.DOMAIN, PLATFORM_SCHEMA_MODERN
+            )
+        )
+    )
+    # setup for discovery
     setup = functools.partial(
         _async_setup_entity, hass, async_add_entities, config_entry=config_entry
     )
diff --git a/tests/components/mqtt/test_switch.py b/tests/components/mqtt/test_switch.py
index a7dd0d8c31e..699f0de87f0 100644
--- a/tests/components/mqtt/test_switch.py
+++ b/tests/components/mqtt/test_switch.py
@@ -39,6 +39,7 @@ from .test_common import (
     help_test_setting_attribute_via_mqtt_json_message,
     help_test_setting_attribute_with_template,
     help_test_setting_blocked_attribute_via_mqtt_json_message,
+    help_test_setup_manual_entity_from_yaml,
     help_test_unique_id,
     help_test_update_with_json_attrs_bad_JSON,
     help_test_update_with_json_attrs_not_dict,
@@ -585,3 +586,15 @@ async def test_encoding_subscribable_topics(
         attribute,
         attribute_value,
     )
+
+
+async def test_setup_manual_entity_from_yaml(hass, caplog, tmp_path):
+    """Test setup manual configured MQTT entity."""
+    platform = switch.DOMAIN
+    config = copy.deepcopy(DEFAULT_CONFIG[platform])
+    config["name"] = "test"
+    del config["platform"]
+    await help_test_setup_manual_entity_from_yaml(
+        hass, caplog, tmp_path, platform, config
+    )
+    assert hass.states.get(f"{platform}.test") is not None