Mark Chay Jung Jun (born 18 February 1982) is a Singaporean swimmer who has represented the Republic in, amongst others, the SEA Games and Summer Olympics. His international swimming career began at the 1997 SEA Games, and stretched all the way till the 2005 SEA Games. In between, he has competed in a total of five SEA Games, two Asian Games, two Commonwealth Games and two Olympics.
He has been awarded "Singapore Sportsboy of the Year" in 2000, and Sportsman of the Year in 2001. Chay competed and studied at Brigham Young University in Provo, Utah. He was the Mountain West Conference Champion and despite numerous injuries throughout his junior and senior years, he continued to swim in competitions. Chay graduated from Brigham Young University with a degree in Communications: Communications studies emphasis. After just missing the qualifying for the Olympics, Chay retired from swimming in July 2007.
- 4 × 200 m Freestyle Relay – 7:35.85, 29 November 2005, 23rd SEA Games
- Singapore Swimming Association: Records at the Wayback Machine (archived 2007-03-17)
- Mark Chay at Olympics at Sports-Reference.com
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