John C. Wetherby (July 2, 1880 – November 29, 1899) was a private in the United States Army and a posthumous Medal of Honor recipient for his actions in the Philippine–American War. Wetherby joined the army from Indianapolis in October 1898.

Medal of Honor citation

Rank and organization: Private, Company L, 4th U.S. Infantry. Place and date: Near Imus, Luzon, Philippine Islands, November 20, 1899. Entered service at: Martinsville, Ind. Birth: Morgan County, Ind. Date of issue: April 25, 1902. Citation: "While carrying important orders on the battlefield, was desperately wounded and, being unable to walk, crawled far enough to deliver his orders."