The Climax mine, located in Climax, Colorado, United States, is a major molybdenum mine in Lake and Summit counties, Colorado. Shipments from the mine began in 1915. At its highest output, the Climax mine was the largest molybdenum mine in the world, and for many years it supplied three quarters of the world's supply of molybdenum.

Climax is an extinct mining company town, railroad station, and post office located in Lake County, Colorado, United States. The town site is located at an elevation of 11,342 feet (3,457 m) at Fremont Pass on the Continental Divide of the Americas. The Climax station on the Denver, South Park and Pacific Railroad was the highest railroad station in North America from its construction in 1884 until 1904 and again from 1928 until it was removed in 1937. Although the town was razed in 1962 to make room for the expansion of the Climax Molybdenum Mine, the Climax post office continued operation from December 5, 1917 until January 4, 1974. Climax had the highest elevation post office in the United States from April 1, 1919 to January 1, 1974.