Martin Fox (August 22, 1848 – September 28, 1907) was an American labor union leader.

Born in Cincinnati, Fox followed his father in becoming an iron molder.

[1] He learned the trade at an early age, becoming a journeyman when only 16, and he joined the National Union of Iron Molders.

He moved to Covington, Kentucky, and while there, in 1878, became a trustee of the union.

He stood down as president of the union in 1903, but continued working for it as a paid consultant, until his death at his home in Cincinnati on September 28, 1907.