Jacob Hahn was a cigar maker from Milwaukee, Wisconsin who served one term as a Socialist member of the Wisconsin State Assembly. Hahn was born in Wittlich, Germany on October 10, 1879. He came to Milwaukee in 1883, attended the public schools, learned the craft of cigarmaking, and had been a trade union member of the Cigar Maker's Union for the past thirteen years when elected. Hahn was married to Martha Strasse. He died March 24, 1970 in Milwaukee.