57th Regiment
- 57th (West Middlesex) Regiment of Foot
- 57th Division (disambiguation)
- 57th Field Artillery Regiment (2nd/10th Dragoons), RCA
- 57th Illinois Volunteer Infantry Regiment
- 57th Indiana Infantry Regiment
- 57th Infantry Regiment (Ottoman Army)
- 57th Infantry Regiment (United States)
- 57th Line Infantry Regiment
- 57th New York Volunteer Infantry
- 57th Ohio Infantry
- 57th Pennsylvania Infantry
- 57th United States Colored Infantry
- 57th Virginia Infantry
- French Army