John Mulder was a member of the Wisconsin State Assembly.
Mulder was born to Dutch immigrants on March 22, 1865 in New Amsterdam, Wisconsin. He died on December 9, 1941 and is buried in Onalaska, Wisconsin.
Mulder joined the Assembly in 1929. Additionally, he was Treasurer of La Crosse, Wisconsin, as well as an alderman and a member of the La Crosse Board of Education. He was a Republican.