Grant Earl Mouser Jr. (February 20, 1895 – December 21, 1943) was a U.S. Representative from Ohio for two terms from 1929 to 1933.

He was graduated from the law college of Ohio State University at Columbus in 1917 and was admitted to the bar the same year.

During the First World War was graduated from the Army Medical School at Washington, D.C., in 1918, and served in the United States Army as a second lieutenant in the Medical Corps with the Western Reserve University College Ambulance Unit.

City solicitor of Marion 1924–1927, resigning to become special counsel in the office of the Ohio Attorney General, and served in this capacity until 1929.

[1] This article incorporates public domain material from the Biographical Directory of the United States Congress