Giannis Karagiannis (Greek: G?????? ?a?a???????) (born 25 July 1994), sometimes credited as John Karayiannis, is a Greek Cypriot singer and songwriter who represented Cyprus in the Eurovision Song Contest 2015 with the song "One Thing I Should Have Done".
Previously he tried to represent Cyprus in their national final for the Junior Eurovision Song Contest in 2007 and 2008.