45th Regiment or 45th Infantry Regiment may refer to:

• 45th Rattray's Sikhs, a unit of the British Indian Army
• 45th (Leeds Rifles) Royal Tank Regiment, a unit of the British Army
• 45th Light Anti-Aircraft Regiment, Royal Artillery, a unit of the British Army
• 45th Garrison Regiment, Royal Artillery, a unit of the British Army
• 45th (Nottinghamshire) (Sherwood Foresters) Regiment of Foot, a unit of the British Army
• 45th Cavalry (India), a unit of the Indian Army
• 45th Infantry Regiment (Imperial Japanese Army)
• 45th Detached Reconnaissance Regiment, a special forces unit of the Russian Army
• 45th Infantry Regiment (United States), a unit of the United States Army

• 45th Illinois Volunteer Infantry Regiment
• 45th Iowa Volunteer Infantry Regiment
• 45th New York Volunteer Infantry Regiment
• 45th Wisconsin Volunteer Infantry Regiment
• 45th Ohio Infantry
• 45th Regiment Kentucky Volunteer Mounted Infantry
• 45th Regiment Massachusetts Volunteer Infantry
• 45th United States Colored Infantry Regiment

• 45th Arkansas Infantry (Mounted)
• 45th North Carolina Infantry
• 45th Tennessee Infantry Regiment
• 45th Virginia Infantry

• 45th Division (disambiguation)
• 45th Brigade (disambiguation)
• 45th Squadron (disambiguation)

Topics referred to by the same term

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