The 199th Regiment Pennsylvania Volunteer Infantry, alternately known as the Commercial Regiment, was an infantry regiment of the Union Army in the American Civil War. Raised in Philadelphia in late 1864, the regiment enlisted for one year and was sent to the Army of the James during the Siege of Petersburg. During the Third Battle of Petersburg it assaulted Forts Gregg and Alexander, then pursued the retreating Confederate Army of Northern Virginia, fighting at Rice's Station and Appomattox Court House. Following the Confederate surrender at Appomattox, the regiment moved to Richmond, where it mustered out in late June 1865.