26th Regiment
- 26 Engineer Regiment (United Kingdom)
- 26th (Cameronian) Regiment of Foot
- 26th Arkansas Infantry Regiment
- 26th Cavalry (United States, 1963–1988)
- 26th Cavalry Regiment (Philippine Scouts)
- 26th Continental Regiment
- 26th Field Artillery Regiment (Canada)
- 26th Field Artillery Regiment (United States)
- 26th Illinois Volunteer Infantry Regiment
- 26th Indiana Infantry Regiment
- 26th Infantry Regiment (United States)
- 26th Marine Regiment (United States)
- 26th Michigan Volunteer Infantry Regiment
- 26th North Carolina Infantry
- 26th Punjabis
- 26th Regiment Infantry U.S. Colored Troops
- 26th Regiment Kentucky Volunteer Infantry
- 26th Regiment Massachusetts Volunteer Infantry
- 26th Regiment Royal Artillery
- 26th Regiment of Bombay Infantry
- 26th Tank Regiment
- Russian Army