Flag Officer, Carriers and Amphibious Ships (FOCAS) was a senior Royal Navy post that existed from 1970 to 1979.

A Flag Officer with specific responsibilities for command of aircraft carriers within the Royal Navy was first established in September 1931 with the appointment of Rear-Admiral Reginald Henderson as Rear-Admiral, Aircraft Carriers.

The post was held by successive flag officers under the titles listed below.

Post holders included:[4] On hauling down his flag as Vice-Admiral, Home Fleet Aircraft Carriers, about 27 April 1943, Admiral Lyster was appointed Flag Officer Carrier Training and Administration at HMS Monck (HQ Combined Training, Largs), which was transferred from 1 June 1944 to HMS Faraway, a training establishment & HQ of Flag Officer Carrier Training, at Greenock.

Duties may have included (a) being responsible for the Fleet Air Arm afloat (b) ensuring the operational effectiveness of Carrier Task Groups.