Nicolas Kelaidis (born 29 October 1949) is a Greek former professional tennis player.

[1] Kelaidis was born in the Egyptian city of Alexandria, which had a large Greek population at the time.

He played college tennis in the United States, at Clemson University from 1968 to 1971.

[2] During the 1970s, Kelaidis competed on the professional tennis circuit and was a regular member of the Greece Davis Cup team, featuring in a total of 10 ties.

He married Swiss tennis player Lilian Drescher.