28th Regiment
- 11th/28th Battalion, Royal Western Australia Regiment
- 28 Engineer Regiment (United Kingdom)
- 28th (Essex) Searchlight Regiment, Royal Artillery
- 28th (North Gloucestershire) Regiment of Foot
- 28th Arkansas Infantry Regiment
- 28th Cavalry Regiment
- 28th Connecticut Infantry Regiment
- 28th Field Artillery Regiment
- 28th Guards Fighter Aviation Regiment
- 28th Illinois Volunteer Infantry Regiment
- 28th Indiana Infantry Regiment (Colored)
- 28th Infantry Regiment (United States)
- 28th Iowa Volunteer Infantry Regiment
- 28th Marine Regiment (United States)
- 28th Punjabis
- 28th Regiment Kentucky Volunteer Infantry
- 28th Regiment Massachusetts Volunteer Infantry
- 28th Tennessee Infantry Regiment
- 28th Wisconsin Volunteer Infantry Regiment
- The 28th Regiment at Quatre Bras