John Korfas ( Τζον Κόρφας ) (born August 21, 1962 in the USA) is a Greek American retired professional basketball player.
He played for PAOK BC and won the Cup Winners' Cup in 1991, Greek Championship in 1992 and the Greek Cup in 1995. With PAOK BC Korfas was also a Cup Winners' Cup finalist in 1992, and a Greek Cup finalist in 1989, 1990 and 1991. He took the third place with PAOK in the 1993 Euroleague final four in Athens.
After leaving PAOK BC in 1995, John Korfas played for PAO BC and won the Euroleague with them in 1996 and the Intercontinental Cup with them the same year.
In 1998 he moved to Maroussi BC and in 2000 with them he took the third place in the Greek Cup final four.
John Korfas was part of the Greek national basketball team during the Eurobasket 1989.