Lewis Lawrence Lacey (February 17, 1887 – November 1966) was a Canadian polo player.^[1]

Lewis Lacey was born on February 17, 1887, in Montreal, Quebec, Canada.^[2] He was the son of a professional cricketer.^[2] Born as a British citizen, he served for England in World War I before returning to Argentina to pursue his polo career.^[2]

In 1915 he won the Argentine open and become Argentina's second 10-goal polo player. In 1922 he won the United States Open Championship, he would return to play this tournament every few years.^[2] In 1924 he was asked to play for Great Britain in the Paris Olympics, he did not wish to play against Argentina so was not selected for the final team.^[2] In 1924 and 1930 Lacey captained the English team in the International Polo Cup.^[2] In the 1928 Cup of the Americas Lacey was selected to play for Argentina.^[2] Between 1915 and 1937 he won the Argentine open seven times.^[1][2]

He also received attention in 1928 for selling a polo pony for a record US$22,000.^[2] The shirts worn in the 1923 season by the Hurlingham Polo Team were created and sold by Lacey, the short sleeved sports shirts had a mounted polo player on the left breast similar to a contemporary style of fashionable shirts.^[2] He also wrote many essays about polo, including 'Equitation in the Game of Polo' and the 'Judge's Task in Polo Pony Shows'.^[1]

He died in 1966. He was inducted into the Museum of Polo and Hall of Fame in Lake Worth, Florida on February 12, 2010.^[1]