Konstantinos Economidis (Greek: Κωνσταντίνος Οικονομίδης, born November 2, 1977 in Thessaloniki) is a professional Greek tennis player and a former Greek No. 1. In 2007, he qualified for the French Open and defeated Australian Chris Guccione in the first round before losing to Tommy Robredo in the second round. He achieved his career-high singles ranking of World No. 112 in February 2007 and has won 5 Challenger titles.
Despite playing relatively few ATP Tour-level matches, Economidis has impressively managed to post a positive record in both singles and doubles.