diff --git a/esphome/components/sensor/__init__.py b/esphome/components/sensor/__init__.py
index 0c38ceeb37..d01a594889 100644
--- a/esphome/components/sensor/__init__.py
+++ b/esphome/components/sensor/__init__.py
@@ -29,6 +29,7 @@ from esphome.const import (
     CONF_WINDOW_SIZE,
     CONF_MQTT_ID,
     CONF_FORCE_UPDATE,
+    DEVICE_CLASS_DURATION,
     DEVICE_CLASS_EMPTY,
     DEVICE_CLASS_AQI,
     DEVICE_CLASS_BATTERY,
@@ -70,6 +71,7 @@ DEVICE_CLASSES = [
     DEVICE_CLASS_CARBON_DIOXIDE,
     DEVICE_CLASS_CARBON_MONOXIDE,
     DEVICE_CLASS_CURRENT,
+    DEVICE_CLASS_DURATION,
     DEVICE_CLASS_ENERGY,
     DEVICE_CLASS_GAS,
     DEVICE_CLASS_HUMIDITY,
diff --git a/esphome/const.py b/esphome/const.py
index fa5baf4fe2..9f2bed28d1 100644
--- a/esphome/const.py
+++ b/esphome/const.py
@@ -905,6 +905,7 @@ DEVICE_CLASS_AQI = "aqi"
 DEVICE_CLASS_CARBON_DIOXIDE = "carbon_dioxide"
 DEVICE_CLASS_CARBON_MONOXIDE = "carbon_monoxide"
 DEVICE_CLASS_CURRENT = "current"
+DEVICE_CLASS_DURATION = "duration"
 DEVICE_CLASS_ENERGY = "energy"
 DEVICE_CLASS_HUMIDITY = "humidity"
 DEVICE_CLASS_ILLUMINANCE = "illuminance"