George Brown Martin (August 18, 1876 – November 12, 1945), a Democrat, served as a member of the United States Senate from Kentucky.

He studied law and was admitted to the bar in 1900, commencing practice in Catlettsburg.

Before entering politics, Martin was general counsel and director of the Big Sandy & Kentucky River Railway Company and vice president of the Ohio Valley Electric Railway Company.

He had been appointed as a Democrat to fill the vacancy caused by the death of Ollie M. James and served until March 3, 1919.

While in Congress, Martin served as chairman of the U.S. Senate Committee on Expenditures in the Department of Agriculture.