Kostas Pagonis (; born 11 September 1985 in Athens) is a Greek professional footballer, who last played for AEL in the Greek Football League.
Pagonis started playing as an amateur for Akratitos in 2003. After a year playing with the team's youth squad, he was promoted to the first team and became a professional. Since then he has played in many teams mostly in the second and third national division. On 29 June 2012 he signed a one-year contract with AEL.