'Jealous III' was a British naval undertaking by Lieutenant P. A. Williams’s MGB-502 of the 15^th Motor Gun Boat Flotilla to land six agents and collect up to nine agents at the Pointe de St Cast on the coast of German-occupied France (23/24 December 1943).

The undertaking was unsuccessful as the motor gun boat was sighted and engaged by the German shore batteries and had to pull back under cover of smoke.