30th Division
- 30 Squadron (disambiguation)
- 30th Armored Division (United States)
- 30th Army (disambiguation)
- 30th Battalion (disambiguation)
- 30th Brigade (disambiguation)
- 30th Cavalry Division (Soviet Union)
- 30th Division (1st Formation) (People's Republic of China)
- 30th Division (German Empire)
- 30th Division (Imperial Japanese Army)
- 30th Division (Syria)
- 30th Division (United Kingdom)
- 30th Division (Yugoslav Partisans)
- 30th Infantry Division (Poland)
- 30th Infantry Division (United States)
- 30th Infantry Division (Wehrmacht)
- 30th Infantry Division Sabauda
- 30th Regiment (disambiguation)
- 30th Reserve Division (German Empire)
- 30th Rifle Division
- 30th Waffen Grenadier Division of the SS
- Division 30
- List of military divisions by number
- XXX Corps (disambiguation)