John O'Malley (May 13, 1878 – September 15, 1940) was an American politician and businessman.
Born in County Mayo, Ireland, O'Malley emigrated to the United States and settled in St. Louis, Missouri.
He was a stone mason and owned saloons in St. Louis and Milwaukee.
O'Malley served in the Wisconsin State Assembly from 1933 to 1937 and was a Democrat, O'Malley died in a hospital in Milwaukee, Wisconsin after a short illness.
This article about a Democratic Party member of the Wisconsin State Assembly is a stub.