Franklin Knight Lane was an American progressive politician from California. A member of the Democratic Party, he served as United States Secretary of the Interior from 1913 to 1920. He also served as a commissioner of the Interstate Commerce Commission, and was the Democratic nominee for Governor of California in 1902, losing a narrow race in what was then a heavily Republican state.

The United States secretary of the interior is the head of the United States Department of the Interior. The secretary and the Department of the Interior are responsible for the management and conservation of most federal land along with natural resources, leading such agencies as the Bureau of Land Management, the United States Geological Survey, Bureau of Indian Affairs and the National Park Service. The secretary also serves on and appoints the private citizens on the National Park Foundation Board. The secretary is a member of the United States Cabinet and reports to the president of the United States. The function of the U.S. Department of the Interior is different from that of the interior minister designated in many other countries.