103rd Regiment
In military terms, 103rd Regiment may refer to:
Infantry regiments
- 103rd Regiment of Foot (disambiguation), several units of the British Army
- 103rd Regiment (Calgary Rifles), a unit of the Canadian non-permanent militia
- 103rd Indiana Infantry Regiment, a unit of the Union Army
- 103rd Ohio Infantry Regiment, a unit of the Union Army
- 103rd Infantry Regiment (United States)
Other regiments
- 103rd Armor Regiment, a unit of the Pennsylvania National Guard
- 103rd Cavalry Regiment, a former unit of the Pennsylvania National Guard
- 103rd Field Artillery Regiment, a unit of the United States Army
- 103rd (Lancashire Artillery Volunteers) Regiment Royal Artillery