K-58 is a 46.761-mile-long (75.255 km) east–west state highway in the U.S. state of Kansas. K-58's western terminus is at K-99 west of Madison. It runs east through Lamont and Gridley and after a short concurrency with US-75, it goes through LeRoy before ending at the eastern terminus at U.S. Route 169 (US-169) near Colony. It is one of the newer state highways in Kansas formed on September 20, 2004, when K-57 was truncated at K-4 in Dwight. The route changes were made because of K-57's long concurrencies with K-4, K-177, US-50 and K-99.