90th Regiment or 90th Infantry Regiment may refer to:
90th Regiment of Foot (Yorkshire Volunteers), a unit of the British Army, 1779-1784 90th Regiment of Foot (Perthshire Volunteers), a unit of the British Army 90th Armoured Regiment (India), a unit of the Indian Army Royal Winnipeg Rifles, was first raised as the 90th Winnipeg Battalion of Rifles in 1883 90th Infantry Regiment (United States), a unit of the United States Army
American Civil War 90th Illinois Volunteer Infantry Regiment, a unit of the Union (North) Army during the American Civil War 90th New York Volunteer Infantry Regiment, a unit of the Union (Northern) Army 90th Ohio Infantry, a unit of the Union (Northern) Army 90th Pennsylvania Infantry, a unit of the Union (Northern) Army
See also 90th Division (disambiguation) 90 Squadron (disambiguation)