Henry A. Barnhart (September 11, 1858 – March 26, 1934) was an American businessman and politician who served as a U.S. representative from Indiana from 1908 to 1919.

He was a teacher, farmer, surveyor of Fulton County, Indiana from 1885 to 1887, newspaper publisher, and businessman.

He served as director of the United States Bank Trust Co..

Barnhart was elected as a Democrat to the Sixtieth Congress to fill the vacancy caused by the death of United States Representative Abraham L. Brick.

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