The Merlin engine was used in over forty aircraft during World War Two but it is mostly associated with the Supermarine Spitfire, Hawker Hurricane, Avro Lancaster bomber and the de Havilland Mosquito.

Merlin Engine Book

Then there were the Mustang, Battle, Halifax, Wellington, Lincoln, Sea Hornet, etc etc. A Merlin was even put into a captured Messerschmitt Bf 109, all RAF personnel concerned agreeing that the aircraft was now much improved by the change. You might expect this kind of verdict, just as when a captured Spitfire was fitted with a German DB605 engine the same conclusion was reached by the Germans! Here is a full list:

    Armstrong Whitworth Whitley

    Avro Athena

    Avro Lancaster

    Avro Lancastrian

    Avro Lincoln

    Avro Manchester III

    Avro Tudor

    Avro York

    Boulton Paul Balliol and Sea Balliol

    Boulton Paul Defiant

    Bristol Beaufighter II

    CAC CA-18 Mark 23 Mustang

    Canadair North Star

    CASA 2.111B and D

    Cierva Air Horse

    de Havilland Mosquito

    de Havilland Hornet

    Fairey Barracuda

    Fairey Battle

    Fairey Fulmar

    Fairey P.4/34

    Fiat G.59

    Handley Page Halifax

    Handley Page Halton

    Hawker Hart (Test bed)

    Hawker Henley

    Hawker Horsley (Test bed)

    Hawker Hotspur

    Hawker Hurricane and Sea Hurricane

    Hispano Aviación HA-1112

    I.Ae. 30 Ñancú

    Miles M.20

    North American Mustang Mk X

    Renard R.38

    Short Sturgeon

    Supermarine Type 322

    Supermarine Seafire

    Supermarine Spitfire

    Tsunami Racer

    Vickers F.7/41

    Vickers Wellington Mk II and Mk VI

    Vickers Windsor

    Westland Welkin