4th Regiment, Rhode Island Infantry was organized during the American Civil War from 1861 and 1864.
Organized at Providence, 1861. Left state for Washington, D. C., October 2. At Camp Casey till November 28, and at Camp California till December 14. Mustered in October 30, 1861. Attached to Casey's Provisional Division, Army Potomac, October–November, 1861. Howard's Brigade, Sumner's Division, Army of the Potomac, to December, 1861. Parke's 3rd Brigade, Burnside's Expeditionary Corps, to April, 1862. 1st Brigade, 3rd Division, Dept. of North Carolina, to July, 1862. 2nd Brigade, 3rd Division, 9th Army Corps, Army Potomac, to January, 1863. 3rd Brigade, 3rd Division, 9th Army Corps, to April, 1863. 3rd Brigade, 2nd Division, 7th Army Corps, Dept. of Virginia, to July, 1863. 3rd Brigade, Getty's Division, at Portsmouth, Va., Dept. of Virginia and North Carolina, to January, 1864. 3rd Brigade, Heckman's Division, Portsmouth, Va., to March, 1864. Norfolk, Va., to April, 1864. District of St. Mary's Point, Lookout, Md., to July, 1864. 1st Brigade, 2nd Division, 9th Army Corps, Army Potomac, to October, 1864.
Regiment lost during service 5 Officers and 68 Enlisted men killed and mortally wounded and 67 Enlisted men by disease. Total 140.