diff --git a/esphome/const.py b/esphome/const.py
index baaebbf90f..36d2257c30 100644
--- a/esphome/const.py
+++ b/esphome/const.py
@@ -832,6 +832,7 @@ UNIT_MINUTE = "min"
 UNIT_OHM = "Ω"
 UNIT_PARTS_PER_BILLION = "ppb"
 UNIT_PARTS_PER_MILLION = "ppm"
+UNIT_PASCAL = "Pa"
 UNIT_PERCENT = "%"
 UNIT_PULSES = "pulses"
 UNIT_PULSES_PER_MINUTE = "pulses/min"