British Legion can refer to any of the following:
- Royal British Legion, a British charity that provides support to military veterans
- Royal British Legion Industries, a British charity, not affiliated with the Royal British Legion, which helps military veterans along with disabled and unemployed people
- British Legion (1860), a volunteer military unit composed of English and Scottish volunteers who fought for the unification of Italy from 1860 to 1861
- British Legion (American Revolution), a Loyalist cavalry unit which fought in the American Revolutionary War from 1777 to 1782
- British Legions (Spanish: Legión Británica), British volunteer units which fought against Spain in the Spanish American wars of independence