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 ArmyAmerican Civil War regimentsUnion (Northern) Army * 49th Regiment Kentucky Volunteer Mounted Infantry * 49th Illinois Volunteer Infantry Regiment * 49th Wisconsin