85th Regiment or 85th Infantry Regiment may refer to:
85th Regiment of Foot (disambiguation), several units of the British Army 85th Burman Rifles, a unit of the British Indian Army 85th Armoured Regiment (India) 85th Infantry Regiment (United States)
Union Army (American Civil War) 85th Illinois Infantry Regiment 85th Indiana Infantry Regiment 85th Ohio Infantry Regiment 85th Pennsylvania Infantry Regiment
See also 85th Division (disambiguation)