Infantry Regiments
- 20th Infantry Regiment (Philippine Commonwealth)
- 20th Infantry Regiment (United States)
- 20th Pennsylvania Infantry
- 20th Regiment Indiana Infantry
- 20th Maine Regiment
- 20th Maine Volunteer Infantry Regiment
- 20th Regiment of Bengal Native Infantry
- 20th Illinois Volunteer Infantry Regiment
- 20th Wisconsin Volunteer Infantry Regiment
- 20th Michigan Volunteer Infantry Regiment
- 20th Iowa Volunteer Infantry Regiment
- 20th Regiment Massachusetts Volunteer Infantry
- Lancashire Fusiliers, formerly 20th Regiment of Foot
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