The Supermarine Type 553 was a British Mach 2 research aircraft project from 1953 that never proceeded beyond the initial proposal.

The difficulty of achieving Mach 2 flight was realised during the development of the 545, which led to Vickers-Supermarine proposing the 553 with a swept wing that would reduce aerodynamic drag.

It was to have been built using aluminium alloy which limited the top speed, and the Air Ministry wanted a twin engine design in which alternative engines could readily be installed, and 553 development was abandoned.

Lack of endurance was also cited as a problem.

Data from Buttler, 2000, p.77 & 79[1]General characteristics Performance Armament None