The school won the New York State Public High School Athletic Association Boys Basketball Championships Class B in 1989 and placed second in Class A in 2008. The state championship tournament system began in 1979. East Hampton won 1977 state championship in Division A (the tournament was consolidate for all divisions in 1979) and its star player was future NBA player Howard Wood. Wood's younger brother Kenny Wood played for the 1989 team. Both players were coached by Ed Petrie (1933-2015) who coached East Hampton from 1969 until 2010 when he retired at age 77 (including all state title appearances). Petrie had 754 wins with various eastern Lond Island schools -- setting a New York state coaching record. The basketball court is named for Petrie. Petrie was drafted 12th round (84th pick) of the 1956 NBA Draft out of the Seton Hall Pirates by the New York Knicks but only played in the minor leagues for the Hazelton Jets and New Haven Bears before coaching high school.
The school did not field varsity football teams in 2017, 2018, and 2019 because school officials said they could not field 22 people on the team. The school had traditionally in New York Division IV. The school has rejected a proposal to join with Southampton, Sag Harbor and Bridgehampton for football but the combined schools would then complete in Division I which is for Long Island's biggest schools. New York State does not have a true state championship in football as New York City and Long Island schools do not compete. The highest level is the Long Island Football Championships and East Hampton has not appeared in any of those games.