Ioannis Nikolaidis is a Greek chess Grandmaster. Born on December 30, 1968, Nikolaidis earned his International Master title in 1992 and his Grandmaster title in 1995. He won the Greek Chess Championship five times between 1993 and 2000, in addition to the Acropolis International tournament in 1999.
Nikolaidis has represented Greece in several Chess Olympiads. He played board 4 in 1992, board 2 in 1994, and board 1 in 1998 and 2000. His best result was at the 34th Chess Olympiad in Istanbul where he scored 8/12 points.
In addition to his playing career, Ioannis Nikolaidis is an active chess journalist who co-operates with various Greek and international publications. He also served as the trainer of the Greek national team from 2002 to 2004.