Gregory Kaidanov (Russian: Григорий Зиновьевич Кайда́нов, Grigoriy Zinovyevich Kaydanov; born 11 October 1959) is a Soviet-born American chess grandmaster.

He was inducted into the United States Chess Hall of Fame in 2013.

Kaidanov is the head coach of the United States Chess School and teaches at the grandmaster level.

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