John J. Horn (November 2, 1917 – January 6, 1999) was an American labor leader and Democratic Party politician. He served in both houses of the New Jersey Legislature, serving in the New Jersey General Assembly from 1968 to 1974 and in the New Jersey Senate from 1974 to 1976. He was then nominated by Governor of New Jersey Brendan Byrne to join his cabinet as commissioner of the New Jersey Department of Labor and Industry, a position he held from 1976 until 1982.