51st Regiment
# 51st Regiment

51st Regiment or 51st Infantry Regiment may refer to:

* 51st Regiment of Foot (disambiguation), several units of the British Army
* 51st Highland Volunteers, a unit of the British Army
* 51st Infantry Regiment (United States)
* 51st Armoured Regiment (India)
* 51st Coast Artillery Regiment, a unit of the United States Army
* 51st (Leeds Rifles) Royal Tank Regiment
* 51st (Highland) Searchlight Regiment, Royal Artillery
* 51st (London) Heavy Anti-Aircraft Regiment, Royal Artillery
* 51st (Westmoreland and Cumberland Yeomanry) Field Regiment, Royal Artillery
* 51st Sikhs (Frontier Force), a unit of the British Indian Army

Union Army (American Civil War):

* 51st Illinois Infantry Regiment
* 51st Indiana Infantry Regiment
* 51st Regiment Massachusetts Volunteer Infantry
* 51st New York Volunteer Infantry
* 51st Ohio Infantry
* 51st Pennsylvania Infantry Regiment
* 51st Wisconsin Volunteer Infantry Regiment
* 51st United States Colored Infantry Regiment
