The 2nd Ohio Cavalry was a cavalry regiment that served in the Union Army during the American Civil War.
The 2nd Ohio Cavalry was organized in Cleveland, Ohio and at Camp Dennison near Cincinnati, Ohio, from August to October 1861, and mustered in for a three years under the command of Colonel Charles Doubleday.
Men were detached from the regiment to form the 25th Ohio Battery at Fort Scott, Kansas, on August 27, 1862. The initial designation of the battery was 3rd Kansas Independent Battery (not be confused with the 3rd Independent Battery Kansas Light Artillery), but was officially changed to 25th Ohio Battery February 17, 1863. The battery was mustered in for three years service under the command of Captain Julius L. Hadley.
The regiment was attached to Doubleday's Brigade, Department of the Missouri, February to June 1862. Fort Scott, Kansas, to August 1862. Solomon's Brigade, Department of Kansas, to October 1862. 1st Brigade, 1st Division, Army of the Frontier, to December 1862. At Columbus, Ohio, to April 1863. Kautz's 1st Cavalry Brigade, District of Central Kentucky, Department of the Ohio, to June 1863. 3rd Brigade, 1st Division, XXIII Corps, Army of the Ohio, to August 1863. 3rd Brigade, 4th Division, XXIII Corps, to November 1863. 1st Brigade, 2nd Division Cavalry, XXIII Corps, to February 1864. At Columbus, Ohio, to April 1864. Cavalry, IX Corps, Army of the Potomac, to May 24, 1864. 1st Brigade, 3rd Division, Cavalry Corps, Army of the Potomac, and Middle Military Division, to May 1865. Department of the Missouri to October 1865.