The Armstrong Siddeley Screamer was a British rocket engine intended to power the Avro 720 manned interceptor aircraft (Avro's competitor to the Saunders-Roe SR.53 for a rocket-powered interceptor).

Thrust was variable, up to a maximum of 8,000 lbf (36 kN).

[1][2][3] Work on the Screamer started in 1946, with the first static test at Armstrong Siddeley's rocket plant at Ansty in March 1954.

[5] In 1951, a Gloster Meteor F.8 was experimentally fitted with a Screamer mounted below the fuselage.

[1][6] The Screamer project was cancelled in March 1956, at a reported total cost of £650,000.