Lewis Francis Byington (May 24, 1868 - May 7, 1943) was member of California state assembly 24th District, 1877–80, California.
Mr. Byington was born in Downieville, California, one of the historic mining towns in northern California. He was a son of Lewis Byington, one of the early pioneer citizen of northern California and Catherine (Freehill) Byington. His grandmother was Abigail Webster, a cousin of Daniel Webster.
His sister, Mary Emma Byington, was married to Tirey L. Ford, 18th California Attorney General 1899-1900.
He later graduated from Santa Clara College, now the University of Santa Clara. He earned his law degree at Hastings College of Law.
Lewis Byington was a member of the California bar and practiced his profession in San Francisco since 1890. Byington was president of the San Francisco civil service commission for major James Rolph, Jr. In 1898 he was elected a Supervisor of San Francisco. In 1899 he was elected District Attorney, in which position he prosecuted Cordelia Botkin.
Byington wrote "The history of San Francisco (1931)," "Downieville and its Historic Past," and the "Sierra County and Its Historic Past."