The term CAV or Cav may refer to the following:
- Cav., an abbreviation for Cavaliere, an Italian order of knighthood
- Cav., a botanical designation for plants named by Spanish taxonomic botanist Antonio Jose Cavanilles
- Curia advisari vult (literally the court wishes to be advised), a Latin legal term reserving judgment until a subsequent day
- X-41 Common Aero Vehicle, a classified experimental vehicle by the US military
- Constant air velocity, a type of HVAC (heating, ventilating, and air conditioning) system wherein the flow rate of air is constant, but the temperature is varied
- Compressed air vehicle, a type of vehicle powered by an engine that uses compressed air stored in a tank