The 9th Regiment, Vermont Volunteer Infantry (or 9th VVI) was a three years' infantry regiment in the Union Army during the American Civil War. It served in the Eastern Theater, from July 1862 to December 1865. It served in the VII, XVII and XXIV Corps. The 9th Vermont Infantry was captured at the Battle of Harpers Ferry during the 1862 Maryland Campaign, but later fought well with the VII, XVIII and XXIV Corps in eastern Virginia and North Carolina, and was one of the first units to enter Richmond, Virginia in April 1865. The regiment mustered out of service on December 1, 1865.