John Vernou "Black Jack" Bouvier III (/ˈbuːvieɪ/ BOO-vee-ay; May 19, 1891 – August 3, 1957) was an American Wall Street stockbroker and socialite.

[5][6][7] John Vernou Bouvier III attended Philips Exeter Academy and Columbia Grammar & Preparatory School.

He then studied at Columbia College, his father's alma mater, where he played tennis for two years before transferring to the Sheffield Scientific School at Yale University.

[12] On April 7, 1920, the New York Sun published an engagement announcement[13] for Bouvier and Miss Eleanor Carroll Daingerfield Carter, of Baltimore.

In June 1942, Janet Lee Bouvier married Hugh Dudley Auchincloss, Jr.[16] Janet reportedly did not want her ex-husband to escort his daughter, Jacqueline, down the aisle for her 1953 wedding to John F. Kennedy as he had done at the wedding of his other daughter, Lee, the previous year, so Jacqueline was instead escorted by her step-father.

However, some reports indicated Bouvier was too intoxicated to escort his daughter, leading Auchincloss to step in to give the bride away.

[20] His funeral, which was arranged by his daughters Jacqueline and Lee, was held at St. Patrick's Cathedral in Manhattan after which his body was buried in the Bouvier family plot at Most Holy Trinity Catholic Cemetery in East Hampton, New York.

He was portrayed by Fred Ward in the TV film biography ‘’Jackie Bouvier Kennedy Onassis’’ in 2000.