81st Regiment of Foot (disambiguation)

Three regiments of the British Army have been numbered the 81st Regiment of Foot:


 * 81st Regiment of Foot (Invalids), raised in 1757 and renumbered the 71st in 1764
 * 81st Regiment of Foot (Aberdeenshire Highland Regiment), numbered the 81st in 1778
 * 81st Regiment of Foot (Loyal Lincoln Volunteers), raised in 1793