| Giannis Karagiannis | |
| Alias: | John Karayiannis |
| Birth Date: | 25 July 1994 |
| Birth Place: | Limassol, Cyprus |
| Instrument: | Vocals |
| Genre: | Pop |
| Occupation: | Singer, songwriter |
Giannis Karagiannis (Γιάννης Καραγιάννης) (born 25 July 1994), sometimes credited as John Karayiannis, is a Cypriot singer and songwriter who represented Cyprus in the Eurovision Song Contest 2015 with the song "One Thing I Should Have Done".[1] Previously he tried to represent Cyprus in their national final for the Junior Eurovision Song Contest in 2007 and 2008.