John Jay O'Connor III (January 10, 1930 – November 11, 2009) was an American lawyer and the husband of United States Supreme Court Associate Justice Sandra Day O'Connor, the first woman to serve on the court.
O'Connor, a prominent lawyer in Arizona, suffered from Alzheimer's disease during his later life.
His illness played a significant role in Sandra Day O'Connor's decision in 2005 to retire from the Supreme Court.