diff --git a/esphome/components/thermostat/climate.py b/esphome/components/thermostat/climate.py
index cf592956b0..a883c47582 100644
--- a/esphome/components/thermostat/climate.py
+++ b/esphome/components/thermostat/climate.py
@@ -9,7 +9,6 @@ from esphome.const import (
     CONF_COOL_DEADBAND,
     CONF_COOL_MODE,
     CONF_COOL_OVERRUN,
-    CONF_CUSTOM_FAN_MODES,
     CONF_DEFAULT_MODE,
     CONF_DEFAULT_TARGET_TEMPERATURE_HIGH,
     CONF_DEFAULT_TARGET_TEMPERATURE_LOW,
@@ -659,7 +658,6 @@ CONFIG_SCHEMA = cv.All(
                 }
             ),
             cv.Optional(CONF_PRESET): cv.ensure_list(PRESET_CONFIG_SCHEMA),
-            cv.Optional(CONF_CUSTOM_FAN_MODES): cv.ensure_list(cv.string_strict),
             cv.Optional(CONF_ON_BOOT_RESTORE_FROM): validate_on_boot_restore_from,
             cv.Optional(CONF_PRESET_CHANGE): automation.validate_automation(
                 single=True
@@ -1019,12 +1017,3 @@ async def to_code(config):
     ]
     if custom_preset_names:
         cg.add(var.set_custom_presets(custom_preset_names))
-
-    # Collect custom fan modes (filter out standard enum fan modes)
-    custom_fan_modes = [
-        mode
-        for mode in config.get(CONF_CUSTOM_FAN_MODES, [])
-        if mode.upper() not in climate.CLIMATE_FAN_MODES
-    ]
-    if custom_fan_modes:
-        cg.add(var.set_custom_fan_modes(custom_fan_modes))