Deák or Deak is a surname.
Deak may also refer to:
Pavle Nestorović, also known as Deak, 17th century Austrian military officer William Sterling Parsons (1901–1953), nicknamed "Deak", American rear admiral, ordnance expert and weaponeer on the Enola Gay when it dropped the first atomic bomb, on Hiroshima Major Vic "Deak" Deakins, villain of the 1996 film Broken Arrow, played by John Travolta Deák Party, a Hungarian political party in the 1860s and 1870s led by Ferenc Deák