63rd Regiment
- 63rd (The West Suffolk) Regiment of Foot
- 63rd Armor Regiment
- 63rd Cavalry (India)
- 63rd Illinois Volunteer Infantry Regiment
- 63rd Indiana Infantry Regiment
- 63rd Infantry Division (United States)
- 63rd New York Infantry
- 63rd Ohio Infantry
- 63rd Palamcottah Light Infantry
- 63rd Pennsylvania Infantry
- 63rd United States Colored Infantry Regiment
- 63rd Virginia Infantry
- British Army
- British Indian Army
- Indian Army
- US Army