John Adam Hazelwood (October 28, 1869 – January 8, 1923) was an American lawyer and politician.
Born in the town of Concord, Jefferson County, Wisconsin, Hazelwood went to the public schools. Hazel also went to St. John's Northwestern Military Academy, Valparaiso University, and Indiana University Maurer School of Law. He taught school. Hazelwood practiced law in Hartford, Wisconsin, Jefferson, Wisconsin and was the Jefferson city attorney. From 1907 to 1911, Hazelwood served in the Wisconsin State Senate and was a Democrat. He later moved to Madison, Wisconsin and the secretary of the Wisconsin Civil Service Commission. Then, he moved to Milwaukee, Wisconsin and continued to practice law. At the time of his death, Hazelwood served as chairman of the Wisconsin Highway Commission. He died at his home, in Milwaukee, Wisconsin after a six-week illness.