86th Regiment

86th Regiment may refer to:


 * 86th Infantry Regiment (Philippine Commonwealth Army), a unit of the Philippine Commonwealth Army
 * 86th Regiment of Foot (Rutland Regiment), a unit of the United Kingdom Army
 * 86th (Royal County Down) Regiment of Foot, a unit of the United Kingdom Army
 * 86th Illinois Volunteer Infantry Regiment, a unit of the Union (Northern) Army during the American Civil War