James Montaudevert "Monte" Waterbury Jr. (April 24, 1876 – August 28, 1920) was an American businessman and a 10-goal polo handicap player.

[1] Together with his brother Lawrence Waterbury, Harry Payne Whitney and Devereaux Milburn, known collectively as the "Big Four," he competed and won the 1909 International Polo Cup.

[11] Waterbury was linked to stage actress Eleanor Pendleton, who later married Louis Ream, son of millionaire businessman Norman B.

[12] After Eleanor's divorce from Ream, she moved into the Hotel St. Louis, across from Waterbury's apartment at the northwest corner of Madison Avenue and 32nd Street, and they resumed their relationship.

[13] Waterbury died at the age of 44 on August 28, 1920, from an apparent heart attack one day after arriving at a health resort in French Lick, Indiana.

[14] The annual Monty Waterbury Cup at the Meadow Brook Club in Westbury, Long Island was named in his honor, with the first match occurring in 1922.