Mark Mendelblatt (born February 19, 1973) is an American yachtsman.
Married to Carolina Borges He primarily sails the Laser, a one-design class of small (13 ft 0 in or 3.96 m long, and 130 lb or 59 kg) single-handed sailing dinghy.
Beginning in 2005, he also started to race in the two-person keelboat Star class.
When he was 11 years old, he won the International Optimist Dinghy National Sailing Championships, and when he was 18, he won the Laser II World Championships.
A three-time college All-American at Tufts University, he won a silver medal in the Laser at the 1999 Pan American Games.
In 2004, he won a silver medal at the Laser World Championships.