Joseph Franklin Ferdinand Valentine (1856 – February 7, 1930) was an American labor union leader.
Born in Baltimore, Valentine completed an apprenticeship as an iron molder, then moved to San Francisco.
He joined the Iron Molders' Union of North America, and was president of its local 164 from 1880.
[1] In 1904, Valentine was arrested on a charge of aiding and abetting in the malicious destruction of property, after some unions were alleged to have blown up molds used at the Eureka Foundry.
He also served on the executive of the National Civic Federation from 1904, and as a vice-president of the Metal Trades Department.