John Raglan Glascock (August 25, 1845 – November 10, 1913) was an American lawyer and politician who served one term as a U.S. Representative from California from 1883 to 1885.

Born in Panola County, Mississippi, Glascock moved to California in 1856 with his parents, who settled in San Francisco.

He attended the public schools and graduated from the University of California at Berkeley in 1865.

He served as district attorney of Alameda County, California from 1875 to 1877.

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