Fred Leonard Blackmon (born September 15, 1873) was an American politician who represented the state of Alabama in the United States House of Representatives in the early twentieth century. A member of the Democratic Party, he served as a U.S. Representative from April 4, 1911, to March 3, 1923. Over the course of his congressional career, Blackmon completed six terms in the House, reflecting sustained support from his constituents and a significant period of legislative service.

During his tenure, Blackmon served as a Representative for Alabama without a specifically designated numbered district in the available record, noted here as district “-1.” His service in Congress placed him among the historical members who helped shape federal policy during a period that spanned the years before, during, and immediately after World War I. After leaving office in 1923, he was regarded as a former member of Congress, and his career remains part of Alabama’s congressional history.