75th Regiment or 75th Infantry Regiment may refer to:
75th Regiment of Foot (disambiguation), several units of the British Army 75th (Middlesex) Searchlight Regiment, Royal Artillery 75th Cavalry Regiment, United States 75th Field Artillery Regiment, United States 75th Infantry Regiment (United States) 75th Infantry Regiment (Ranger), United States (1969–1986) 75th Ranger Regiment (United States) 75th Carnatic Infantry, British Indian Army
Union Army (American Civil War): 75th Illinois Volunteer Infantry Regiment 75th Indiana Infantry Regiment 75th Ohio Infantry 75th Pennsylvania Infantry
See also 75th Brigade (disambiguation) 75th Division (disambiguation)