diff --git a/esphome/components/number/__init__.py b/esphome/components/number/__init__.py
index 303535c138..d9c16fd7a9 100644
--- a/esphome/components/number/__init__.py
+++ b/esphome/components/number/__init__.py
@@ -26,6 +26,7 @@ from esphome.const import (
     DEVICE_CLASS_BATTERY,
     DEVICE_CLASS_CARBON_DIOXIDE,
     DEVICE_CLASS_CARBON_MONOXIDE,
+    DEVICE_CLASS_CONDUCTIVITY,
     DEVICE_CLASS_CURRENT,
     DEVICE_CLASS_DATA_RATE,
     DEVICE_CLASS_DATA_SIZE,
@@ -82,6 +83,7 @@ DEVICE_CLASSES = [
     DEVICE_CLASS_BATTERY,
     DEVICE_CLASS_CARBON_DIOXIDE,
     DEVICE_CLASS_CARBON_MONOXIDE,
+    DEVICE_CLASS_CONDUCTIVITY,
     DEVICE_CLASS_CURRENT,
     DEVICE_CLASS_DATA_RATE,
     DEVICE_CLASS_DATA_SIZE,
diff --git a/esphome/components/sensor/__init__.py b/esphome/components/sensor/__init__.py
index 6077f5dc1f..262e69d75b 100644
--- a/esphome/components/sensor/__init__.py
+++ b/esphome/components/sensor/__init__.py
@@ -43,6 +43,7 @@ from esphome.const import (
     DEVICE_CLASS_BATTERY,
     DEVICE_CLASS_CARBON_DIOXIDE,
     DEVICE_CLASS_CARBON_MONOXIDE,
+    DEVICE_CLASS_CONDUCTIVITY,
     DEVICE_CLASS_CURRENT,
     DEVICE_CLASS_DATA_RATE,
     DEVICE_CLASS_DATA_SIZE,
@@ -103,6 +104,7 @@ DEVICE_CLASSES = [
     DEVICE_CLASS_BATTERY,
     DEVICE_CLASS_CARBON_DIOXIDE,
     DEVICE_CLASS_CARBON_MONOXIDE,
+    DEVICE_CLASS_CONDUCTIVITY,
     DEVICE_CLASS_CURRENT,
     DEVICE_CLASS_DATA_RATE,
     DEVICE_CLASS_DATA_SIZE,
diff --git a/esphome/const.py b/esphome/const.py
index 9c4e451029..a13a0af8eb 100644
--- a/esphome/const.py
+++ b/esphome/const.py
@@ -1070,6 +1070,7 @@ DEVICE_CLASS_BUTTON = "button"
 DEVICE_CLASS_CARBON_DIOXIDE = "carbon_dioxide"
 DEVICE_CLASS_CARBON_MONOXIDE = "carbon_monoxide"
 DEVICE_CLASS_COLD = "cold"
+DEVICE_CLASS_CONDUCTIVITY = "conductivity"
 DEVICE_CLASS_CONNECTIVITY = "connectivity"
 DEVICE_CLASS_CURRENT = "current"
 DEVICE_CLASS_CURTAIN = "curtain"