91st Regiment

91st Regiment or 91st Infantry Regiment may refer to:

91st Regiment of Foot (disambiguation), several units of the British Army 91st Punjabis (Light Infantry), a unit of the British Indian Army 91st Cavalry Regiment, United States 91st Coast Artillery (United States)

Union Army (American Civil War): 91st Illinois Volunteer Infantry Regiment 91st Indiana Infantry Regiment 91st New York Volunteer Infantry Regiment 91st Ohio Infantry 91st Pennsylvania Infantry

See also 91st Division (disambiguation)