James H. McGillan (January 7, 1870 – March 7, 1935) was an American politician and lawyer who served as the 34th mayor of Green Bay, Wisconsin, from 1927 to 1929.
Following graduation, he began practicing law in Marinette, Wisconsin, in 1891.
During World War I, he served as an officer in the United States Navy.
Following the war, he transferred to the United States Navy Reserve.
In 1928, he was a candidate for the United States House of Representatives from Wisconsin's 9th congressional district, losing to incumbent George J.