Kellen Clemens (born June 6, 1983 in Lakeview, Oregon) is an American football quarterback who currently plays for the New York Jets of the National Football League. He was drafted by the Jets in the second round (49th overall) of the 2006 NFL Draft. He played collegiately at Oregon.

He played high school football for the Burns Hilanders and led them to the Oregon state 3A championship game in 1999. In his high school career he threw for a state-record 8,646 yards (610-of-1,112) and 102 TD. He also received USA Today All-American honors and Oregon Gatorade Player of the Year while in high school, where he completed 218 of 395 passes for 3,464 yards (3,167 m) and 37 TD with 325 rushing yards and 15 TD in his senior season. He was coached by Terry Graham using the run and shoot offense.

Clemens played college football at the University of Oregon. He assumed the role of starting QB in all 13 games in 2003 and responded by throwing for more TD passes and yards than any sophomore in school history, surpassing Dan Fouts--who had 16 TDs and 2,390 yards (2,190 m), in 1970. He posted three rushing TD, three passing TD and a career-best 437 passing yards in a road victory over Washington State as a junior. He was a senior during the 2005 season, and was pursuing several school records until he broke his ankle while playing a game at Arizona. He would miss the remaining three games of the season. Still, he finished 2005 with 2,406 passing yards, 19 TDs, only 4 interceptions, and a 152.87 passer efficiency rating. He finished his Oregon career with 7,555 passing yards.