R.J. Mitchell yana nufin Reginald Joseph Mitchell, injiniyan jirgin sama na Ingila wanda ya shahara wajen kera jirgin Supermarine Spitfire, wani fitaccen jirgin saman yaki da Rundunar Sojan Sama (RAF) ta yi amfani da shi a lokacin yakin duniya na biyu. An haifi Mitchell a cikin 1895 a Stoke-on-Trent, Ingila, kuma ya fara aikin injiniya a farkon shekarun 1900. Ya shiga Supermarine Aviation Works a cikin 1916, inda a ƙarshe ya zama babban mai zane. Ayyukan Mitchell a kan Spitfire ya taimaka wajen nasarar RAF a lokacin yakin Birtaniya. Ya rasu a shekara ta 1937 yana da shekaru 42 a duniya saboda ciwon daji.