Charles Rivers Ellet (June 1, 1843 – October 29, 1863) was a colonel in the Union Army during the American Civil War. He served in the United States Ram Fleet under his father Charles Ellet, Jr. and as commanding officer of the ram fleet as part of the Mississippi Marine Brigade under his uncle Alfred W. Ellet. He commanded the ram ships USS Queen of the West, USS Switzerland, USS Lancaster and USS Monarch during the brown-water navy battle for control of the Mississippi River and its tributaries as part of the Vicksburg Campaign from 1862 to 1863.