49th Regiment or 49th Infantry Regiment may refer to:
49th Hutsul Rifle Regiment, a unit of the Polish Army 49th (Princess Charlotte of Wales's) (Hertfordshire) Regiment of Foot, a unit of the British Army 49th Royal Tank Regiment, a unit of the British Army 49th Field Artillery Regiment, RCA, a unit of the Canadian Army The Hastings and Prince Edward Regiment, a unit of the Canadian Army 49th Field Artillery Regiment (United States), a unit of the US Army 49th Infantry Regiment (United States), a unit of the US Army 49th Regiment of Bengal Native Infantry, a unit of the East India Company's Bengal Army
American Civil War regiments Union (Northern) Army 49th Regiment Kentucky Volunteer Mounted Infantry 49th Illinois Volunteer Infantry Regiment 49th Wisconsin Volunteer Infantry Regiment 49th Indiana Infantry Regiment 49th New York Volunteer Infantry 49th Ohio Infantry 49th Pennsylvania Infantry
Confederate (Southern) Army 49th North Carolina Infantry 49th Virginia Infantry
See also 49th Division (disambiguation) 49th Brigade (disambiguation) 49th Squadron (disambiguation)