Dmitry Vladimirovich Gaag (Дмитрий Владимирович Гааг; born 20 March 1971 in Karaganda) is an athlete from Kazakhstan, who competes in triathlon.

He took fourth place with a total time of 1:49:03.57.

On 6 September 2008 Gaag was banned for two years beginning 20 June 2008, after testing positive for recombinant erythropoietin (EPO).

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