90th Regiment

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