19th Regiment
- 15th/19th The King's Royal Hussars
- 19th Alberta Dragoons
- 19th Battalion (disambiguation)
- 19th Brigade (disambiguation)
- 19th Corps (disambiguation)
- 19th Division (disambiguation)
- 19th Group (disambiguation)
- 19th Illinois Volunteer Infantry Regiment
- 19th Indiana Volunteer Infantry Regiment
- 19th Infantry Regiment (United States)
- 19th Iowa Volunteer Infantry Regiment
- 19th King George's Own Lancers
- 19th Light Dragoons
- 19th Maine Volunteer Infantry Regiment
- 19th Michigan Volunteer Infantry Regiment
- 19th Regiment Alabama Infantry
- 19th Regiment Royal Artillery
- 19th Royal Hussars
- 19th Squadron (disambiguation)
- 19th Tennessee Infantry Regiment
- 19th United States Colored Infantry Regiment
- 19th Wisconsin Volunteer Infantry Regiment
- 4th/19th Prince of Wales's Light Horse
- Flying Regiment 19, Finnish Air Force
- Green Howards
- Kumaon Regiment
- Norrbottens regemente
- Västerbottens regemente