Louis Renninger (August 25, 1841 - November 17, 1908) was a Union soldier who received the Medal of Honor for gallantry in the American Civil War. On May 22, 1863, Renninger was one of 150 Union soldiers who volunteered to lead an assault on the Confederate heights at the Battle of Vicksburg, Mississippi. The plan was for the volunteer storming party to build a bridge across a moat and plant scaling ladders against the enemy embankment in advance of the main attack.