Joseph Thomas O'Neill (November 11, 1931 – January 25, 2022) was an American politician and lawyer.
O'Neill was born in Saint Paul, Minnesota, on November 11, 1931.
He graduated from Saint Thomas Academy, in Mendota Heights, Minnesota, in 1949.
He served in the United States Air Force, from 1956 to 1959, as a junior advocate officer and was commissioned a first lieutenant.
O'Neill practiced law in Saint Paul, Minnesota.