
The International Polo Cup, also called the Newport Cup and the Westchester Cup, is a trophy in polo that was created in 1876 and was played for by teams from the United States and United Kingdom. The match has varied in length over the years from a single game to the best of three games. In 1886 the two nations decided to make the polo match a continuing competition. A total of 12 matches were conducted between 1886 and 1939 between the two countries. The tournament was suspended during World War II and, due to changing times and interests, not revived until 1992. The last match was held on July 28, 2013 at Guards Polo Club.

Rodolphe Louis Agassiz was a ten goal polo champion who participated in the 1902 International Polo Cup. He later became chairman of the board of the Calumet and Hecla Mining Company.

Major Frederick Whitfield Barrett was an international polo player. He trained race horses for three British Monarchs George V, Edward VIII and George VI.

Raymond Rodgers Belmont was a champion polo player who took his own life in 1887 with a gunshot.

Walter Selby Buckmaster was a British polo player in the 1900 Summer Olympics and in the 1908 Summer Olympics.

Leslie Cheape (1882–1916) was a British soldier and famous polo player in the 1910s

John Elliot Cowdin was an American polo player.

Captain Arthur Noel Edwards was an English polo player who participated in the 1911 and 1913 International Polo Cup as an alternate.

Sir Frederick (Charles) Maitland Freake, 3rd Baronet was a British polo player in the 1900 Summer Olympics and in the 1908 Summer Olympics.

Colonel Geoffrey Hardinge Phipps-Hornby, CBE, was a British Army officer and international polo player.

Winston Frederick Churchill Guest, was an Anglo-American polo champion and a member of the Guest family of Britain.

Stewart Birrell Iglehart was a rancher, ice hockey and polo player. He was born in Valparaíso, Chile but moved to the United States at a young age. As a child he learned to play both ice hockey and polo. While in prep school he was offered a professional ice hockey contract but declined. Following prep school he attended Yale University, where he continued to play ice hockey and polo. He became one of the best defensemen in college hockey and was selected to play in two different Winter Olympics. Iglehart did not attend either. In 1933 he played for Team USA at the World Ice Hockey Championships, winning a gold medal. Following the tournament he continued to play amateur hockey, but quit to concentrate on polo.

Foxhall Parker Keene was an American thoroughbred race horse owner and breeder, a world and Olympic gold medallist in polo and an amateur tennis player. He was rated the best all-around polo player in the United States for eight consecutive years, a golfer who competed in the U.S. Open, and a pioneer racecar driver who vied for the Gordon Bennett Cup. In addition to his substantial involvement in flat racing, he was also a founding member of the National Steeplechase Association.

Rene Morgan La Montagne, Jr. was an American polo player who in 1914 won the International Polo Cup.

Lewis Lawrence Lacey was an Anglo-Argentine polo player.

Brigadier-General John Hardress Lloyd was an Anglo-Irish soldier and polo player. He was awarded a DSO and made a Chevalier of the Légion d’Honneur for his service in the British Army during the First World War. As a polo player he won a silver medal with the Ireland team at the 1908 Summer Olympics.

Vivian Noverre Lockett was a colonel in the British army, and a 10 goal handicap player. He won a gold medal for the United Kingdom at the 1920 Summer Olympics in Antwerp.

Devereux Milburn was an American champion polo player in the early to mid twentieth century. He was one of a group of Americans known as the Big Four in international polo, winning the Westchester Cup six times. He is "remembered as possibly the best polo player this country ever produced." His given name has been alternatively spelled as "Devereaux" in some publications.

Captain Harry Rich, also known as Henry Rich, was a champion polo player. He was a six-goal handicap player and was the winner of the Narragansett Cup and the Gladstone Cup. He was a member of the Polo Pony Society.

Lieutenant-Colonel Ralph Gerald Ritson was a member of the Inniskilling Dragoons and a champion polo player with a ten-goal handicap.

Major Louis Ezekiel Stoddard was an American 10-goal handicap polo player. He participated in the 1913 and 1921 International Polo Cup. He was the chairman of the United States Polo Association from 1921 to 1936. He won the Junior Polo Championship, Senior Polo Championship, U.S. Open Polo Championship and the Monty Waterbury Cup twice each.

Robert Early Strawbridge Jr. was an American polo champion and chairman of the United States Polo Association.

William Knapp Thorn, Jr. was an American champion polo player and the grandson of Commodore Cornelius Vanderbilt. Also, he was a hunter and horse-rider. He was one of the best-known sportsmen in the United States and France.

Brigadier Henry Archdale Tomkinson was a British Army officer and polo champion. He was captain of the team that won the 1914 and 1921 International Polo Cup. In 1927 he was the team manager for the International Polo Cup game.

James Montaudevert "Monte" Waterbury, Jr. was an American businessman and a 10-goal polo handicap player. 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.

Captain John Henry Watson was an Irish champion polo player. He won the International Polo Cup in Newport, Rhode Island in 1876 alongside Captain Thomas Hone, Malcolm Orme Little, and Captain the Hon. Richard Lawley, 4th Baron Wenlock.

Harry Payne Whitney was an American businessman, thoroughbred horse breeder, and member of the prominent Whitney family.