Nicholas Kalogeropoulos (Greek: Νικόλαος Καλογερόπουλος; born February 18, 1945), also known as Nicky Kalo, is a retired Greek tennis player who won a bronze medal at the 1971 Mediterranean Games. In doubles, he finished second at the 1968 Italian Open. He was ranked as best Greek player in 1962–74 and was a member of the Greek Davis Cup team in 1963–81.
Kalogeropoulos was born in Costa Rica to Greek parents, where he started training in tennis and spent many years of his life. In 1963 he won junior Wimbledon and French Championships. He retired in 1978.