25th Regiment
- 25 Squadron (disambiguation)
- 25th Arkansas Infantry Regiment
- 25th Army (disambiguation)
- 25th Aviation Regiment (United States)
- 25th Brigade (disambiguation)
- 25th Connecticut Infantry Regiment
- 25th Continental Regiment
- 25th Dragoons
- 25th Field Artillery Regiment
- 25th Greater Poland Uhlan Regiment
- 25th Illinois Infantry Regiment
- 25th Independent Mixed Regiment
- 25th Indiana Infantry Regiment
- 25th Infantry Regiment (Argentina)
- 25th Infantry Regiment (United States)
- 25th Iowa Infantry Regiment
- 25th Kentucky Infantry Regiment
- 25th Maine Infantry Regiment
- 25th Massachusetts Infantry Regiment
- 25th Michigan Infantry Regiment
- 25th New Jersey Infantry Regiment
- 25th New York Infantry Regiment
- 25th Punjabis
- 25th Regiment of Foot
- 25th SS Police Regiment
- 25th Wisconsin Infantry Regiment
- XXV Corps (disambiguation)