| 91st Regiment of Foot | |
|---|---|
| Active | 1794–1881 |
| Country |  Kingdom of Great Britain (1794–1800) United Kingdom (1801–1881) |
| Branch |  British Army |
| Type | Line Infantry |
| Size | One battalion (two battalions 1804–1815) |
| Motto(s) | Ne Obliviscaris (Do not forget) |
| Engagements | French Revolutionary Wars Napoleonic Wars |
The 91st (Argyllshire Highlanders) Regiment of Foot was a Line Regiment of the British Army, raised in 1794. Under the Childers Reforms it amalgamated with the 93rd (Sutherland Highlanders) Regiment of Foot to form the Argyll and Sutherland Highlanders in 1881.