Clarence Stanley Coe (C. S. Coe) (December 24, 1865 – March 5, 1939) was an American master bridge builder and railroad civil engineer, who supervised the planning and building of the Florida East Coast Railway's Seven Mile Bridge, linking the Florida Keys to Marathon, Monroe County, which, when completed in January 1912, was acclaimed as the longest bridge in the world and an engineering marvel. Later, Coe was appointed the first city manager of Miami, Florida, and after that was appointed chief engineer of Duval County, Florida.