diff --git a/homeassistant/components/mqtt/abbreviations.py b/homeassistant/components/mqtt/abbreviations.py
index f4a32bbdf9d..3c1d0abdb66 100644
--- a/homeassistant/components/mqtt/abbreviations.py
+++ b/homeassistant/components/mqtt/abbreviations.py
@@ -6,9 +6,6 @@ ABBREVIATIONS = {
     "act_stat_t": "activity_state_topic",
     "act_val_tpl": "activity_value_template",
     "atype": "automation_type",
-    "aux_cmd_t": "aux_command_topic",
-    "aux_stat_tpl": "aux_state_template",
-    "aux_stat_t": "aux_state_topic",
     "av_tones": "available_tones",
     "avty": "availability",
     "avty_mode": "availability_mode",
@@ -157,8 +154,6 @@ ABBREVIATIONS = {
     "pos_open": "position_open",
     "pow_cmd_t": "power_command_topic",
     "pow_cmd_tpl": "power_command_template",
-    "pow_stat_t": "power_state_topic",
-    "pow_stat_tpl": "power_state_template",
     "pr_mode_cmd_t": "preset_mode_command_topic",
     "pr_mode_cmd_tpl": "preset_mode_command_template",
     "pr_mode_stat_t": "preset_mode_state_topic",
diff --git a/homeassistant/components/mqtt/climate.py b/homeassistant/components/mqtt/climate.py
index 426bac8e9ca..ac276c37d71 100644
--- a/homeassistant/components/mqtt/climate.py
+++ b/homeassistant/components/mqtt/climate.py
@@ -93,13 +93,6 @@ _LOGGER = logging.getLogger(__name__)
 
 DEFAULT_NAME = "MQTT HVAC"
 
-# Options CONF_AUX_COMMAND_TOPIC, CONF_AUX_STATE_TOPIC
-# and CONF_AUX_STATE_TEMPLATE were deprecated in HA Core 2023.9
-# Support was removed in HA Core 2024.3
-CONF_AUX_COMMAND_TOPIC = "aux_command_topic"
-CONF_AUX_STATE_TEMPLATE = "aux_state_template"
-CONF_AUX_STATE_TOPIC = "aux_state_topic"
-
 CONF_FAN_MODE_COMMAND_TEMPLATE = "fan_mode_command_template"
 CONF_FAN_MODE_COMMAND_TOPIC = "fan_mode_command_topic"
 CONF_FAN_MODE_LIST = "fan_modes"
@@ -113,10 +106,6 @@ CONF_HUMIDITY_STATE_TOPIC = "target_humidity_state_topic"
 CONF_HUMIDITY_MAX = "max_humidity"
 CONF_HUMIDITY_MIN = "min_humidity"
 
-# Support for CONF_POWER_STATE_TOPIC and CONF_POWER_STATE_TEMPLATE
-# was removed in HA Core 2023.8
-CONF_POWER_STATE_TEMPLATE = "power_state_template"
-CONF_POWER_STATE_TOPIC = "power_state_topic"
 CONF_PRESET_MODE_STATE_TOPIC = "preset_mode_state_topic"
 CONF_PRESET_MODE_COMMAND_TOPIC = "preset_mode_command_topic"
 CONF_PRESET_MODE_VALUE_TEMPLATE = "preset_mode_value_template"
@@ -201,7 +190,6 @@ TOPIC_KEYS = (
     CONF_MODE_COMMAND_TOPIC,
     CONF_MODE_STATE_TOPIC,
     CONF_POWER_COMMAND_TOPIC,
-    CONF_POWER_STATE_TOPIC,
     CONF_PRESET_MODE_COMMAND_TOPIC,
     CONF_PRESET_MODE_STATE_TOPIC,
     CONF_SWING_MODE_COMMAND_TOPIC,
@@ -295,8 +283,6 @@ _PLATFORM_SCHEMA_BASE = MQTT_BASE_SCHEMA.extend(
         vol.Optional(CONF_PAYLOAD_OFF, default="OFF"): cv.string,
         vol.Optional(CONF_POWER_COMMAND_TOPIC): valid_publish_topic,
         vol.Optional(CONF_POWER_COMMAND_TEMPLATE): cv.template,
-        vol.Optional(CONF_POWER_STATE_TEMPLATE): cv.template,
-        vol.Optional(CONF_POWER_STATE_TOPIC): valid_subscribe_topic,
         vol.Optional(CONF_PRECISION): vol.In(
             [PRECISION_TENTHS, PRECISION_HALVES, PRECISION_WHOLE]
         ),
@@ -343,16 +329,6 @@ _PLATFORM_SCHEMA_BASE = MQTT_BASE_SCHEMA.extend(
 ).extend(MQTT_ENTITY_COMMON_SCHEMA.schema)
 
 PLATFORM_SCHEMA_MODERN = vol.All(
-    # Support for CONF_POWER_STATE_TOPIC and CONF_POWER_STATE_TEMPLATE
-    # was removed in HA Core 2023.8
-    cv.removed(CONF_POWER_STATE_TEMPLATE),
-    cv.removed(CONF_POWER_STATE_TOPIC),
-    # Options CONF_AUX_COMMAND_TOPIC, CONF_AUX_STATE_TOPIC
-    # and CONF_AUX_STATE_TEMPLATE were deprecated in HA Core 2023.9
-    # Support was removed in HA Core 2024.3
-    cv.removed(CONF_AUX_COMMAND_TOPIC),
-    cv.removed(CONF_AUX_STATE_TEMPLATE),
-    cv.removed(CONF_AUX_STATE_TOPIC),
     _PLATFORM_SCHEMA_BASE,
     valid_preset_mode_configuration,
     valid_humidity_range_configuration,
@@ -363,10 +339,6 @@ _DISCOVERY_SCHEMA_BASE = _PLATFORM_SCHEMA_BASE.extend({}, extra=vol.REMOVE_EXTRA
 
 DISCOVERY_SCHEMA = vol.All(
     _DISCOVERY_SCHEMA_BASE,
-    # Support for CONF_POWER_STATE_TOPIC and CONF_POWER_STATE_TEMPLATE
-    # was removed in HA Core 2023.8
-    cv.removed(CONF_POWER_STATE_TEMPLATE),
-    cv.removed(CONF_POWER_STATE_TOPIC),
     valid_preset_mode_configuration,
     valid_humidity_range_configuration,
     valid_humidity_state_configuration,