The Ninth New Jersey Volunteer Infantry (also called Jersey Muskrats) was an American Civil War infantry regiment from New Jersey that served from October 1861 through July 1865 in the Union Army. The regiment got its nickname, Jersey Muskrats, during the Battle of Roanoke Island when they successfully "sloshed through shoe sucking mud into waist deep water in 'division' formation", giving the regiment a two company front flanking the enemy. The regiment was the last to leave the state in 1861 but the first to see battle.