John Anthony Korfas (Greek Γιάννης Κορφιάτης ) (born August 21, 1962 in Akron, Ohio, USA) is a retired Greek American professional basketball player and a professional basketball coach. He was famous for his peculiar way of throwing (and scoring) free throws with one hand.
Korfas played for PAOK with whom he won the Cup Winners' Cup in 1991, the Greek Championship in 1992, and the Greek Cup in 1995. With PAOK, Korfas was also a Cup Winners' Cup finalist in 1992, and a Greek Cup finalist in 1989, 1990 and 1991. He took third place with PAOK at the 1993 Euroleague Final Four in Athens.
After leaving PAOK in 1995, Korfas played for Panathinaikos and won the Euroleague championship with them in 1996 and the World Club Championship with them the same year. In 1998, he moved to Maroussi winning, in 2000, third place at the Greek Cup final four.