diff --git a/homeassistant/components/mqtt/abbreviations.py b/homeassistant/components/mqtt/abbreviations.py
index 6f2eeeeedd0..758e978bb46 100644
--- a/homeassistant/components/mqtt/abbreviations.py
+++ b/homeassistant/components/mqtt/abbreviations.py
@@ -99,6 +99,7 @@ ABBREVIATIONS = {
     "min_mirs": "min_mireds",
     "max_temp": "max_temp",
     "min_temp": "min_temp",
+    "mode": "mode",
     "mode_cmd_tpl": "mode_command_template",
     "mode_cmd_t": "mode_command_topic",
     "mode_stat_t": "mode_state_topic",
diff --git a/homeassistant/components/mqtt/number.py b/homeassistant/components/mqtt/number.py
index 4e9f237431a..eeac406f668 100644
--- a/homeassistant/components/mqtt/number.py
+++ b/homeassistant/components/mqtt/number.py
@@ -13,11 +13,13 @@ from homeassistant.components.number import (
     DEFAULT_STEP,
     DEVICE_CLASSES_SCHEMA,
     NumberDeviceClass,
+    NumberMode,
     RestoreNumber,
 )
 from homeassistant.config_entries import ConfigEntry
 from homeassistant.const import (
     CONF_DEVICE_CLASS,
+    CONF_MODE,
     CONF_NAME,
     CONF_OPTIMISTIC,
     CONF_UNIT_OF_MEASUREMENT,
@@ -83,6 +85,7 @@ _PLATFORM_SCHEMA_BASE = MQTT_RW_SCHEMA.extend(
         vol.Optional(CONF_DEVICE_CLASS): DEVICE_CLASSES_SCHEMA,
         vol.Optional(CONF_MAX, default=DEFAULT_MAX_VALUE): vol.Coerce(float),
         vol.Optional(CONF_MIN, default=DEFAULT_MIN_VALUE): vol.Coerce(float),
+        vol.Optional(CONF_MODE, default=NumberMode.AUTO): vol.Coerce(NumberMode),
         vol.Optional(CONF_NAME, default=DEFAULT_NAME): cv.string,
         vol.Optional(CONF_OPTIMISTIC, default=DEFAULT_OPTIMISTIC): cv.boolean,
         vol.Optional(CONF_PAYLOAD_RESET, default=DEFAULT_PAYLOAD_RESET): cv.string,
@@ -276,6 +279,11 @@ class MqttNumber(MqttEntity, RestoreNumber):
         """Return the current value."""
         return self._current_number
 
+    @property
+    def mode(self) -> NumberMode:
+        """Return the mode of the entity."""
+        return self._config[CONF_MODE]
+
     async def async_set_native_value(self, value: float) -> None:
         """Update the current value."""
         current_number = value
diff --git a/tests/components/mqtt/test_number.py b/tests/components/mqtt/test_number.py
index 458f1f740e1..603984cffad 100644
--- a/tests/components/mqtt/test_number.py
+++ b/tests/components/mqtt/test_number.py
@@ -5,7 +5,7 @@ from unittest.mock import patch
 
 import pytest
 
-from homeassistant.components import number
+from homeassistant.components import mqtt, number
 from homeassistant.components.mqtt.number import (
     CONF_MAX,
     CONF_MIN,
@@ -24,6 +24,7 @@ from homeassistant.const import (
     ATTR_ASSUMED_STATE,
     ATTR_DEVICE_CLASS,
     ATTR_ENTITY_ID,
+    ATTR_MODE,
     ATTR_UNIT_OF_MEASUREMENT,
     TEMP_FAHRENHEIT,
     Platform,
@@ -702,6 +703,77 @@ async def test_invalid_min_max_attributes(hass, caplog, mqtt_mock_entry_no_yaml_
     assert f"'{CONF_MAX}' must be > '{CONF_MIN}'" in caplog.text
 
 
+async def test_default_mode(hass, mqtt_mock_entry_with_yaml_config):
+    """Test default mode."""
+    topic = "test/number"
+    await async_setup_component(
+        hass,
+        mqtt.DOMAIN,
+        {
+            mqtt.DOMAIN: {
+                number.DOMAIN: {
+                    "state_topic": topic,
+                    "command_topic": topic,
+                    "name": "Test Number",
+                }
+            }
+        },
+    )
+    await hass.async_block_till_done()
+    await mqtt_mock_entry_with_yaml_config()
+
+    state = hass.states.get("number.test_number")
+    assert state.attributes.get(ATTR_MODE) == "auto"
+
+
+@pytest.mark.parametrize("mode", ("auto", "box", "slider"))
+async def test_mode(hass, mqtt_mock_entry_with_yaml_config, mode):
+    """Test mode."""
+    topic = "test/number"
+    await async_setup_component(
+        hass,
+        mqtt.DOMAIN,
+        {
+            mqtt.DOMAIN: {
+                number.DOMAIN: {
+                    "state_topic": topic,
+                    "command_topic": topic,
+                    "name": "Test Number",
+                    "mode": mode,
+                }
+            }
+        },
+    )
+    await hass.async_block_till_done()
+    await mqtt_mock_entry_with_yaml_config()
+
+    state = hass.states.get("number.test_number")
+    assert state.attributes.get(ATTR_MODE) == mode
+
+
+@pytest.mark.parametrize("mode,valid", [("bleh", False), ("auto", True)])
+async def test_invalid_mode(hass, mode, valid):
+    """Test invalid mode."""
+    topic = "test/number"
+    assert (
+        await async_setup_component(
+            hass,
+            mqtt.DOMAIN,
+            {
+                mqtt.DOMAIN: {
+                    number.DOMAIN: {
+                        "state_topic": topic,
+                        "command_topic": topic,
+                        "name": "Test Number",
+                        "mode": mode,
+                    }
+                }
+            },
+        )
+        is valid
+    )
+
+
 async def test_mqtt_payload_not_a_number_warning(
     hass, caplog, mqtt_mock_entry_with_yaml_config
 ):