Sergey Dyachkov (; wuxuu dhashay May 28, 1982) waa dabaalyahan hore oo reer Azerbaijan ah, oo ku takhasusay dhacdooyinka qaabka xorta ah ee orodka. Dyachkov ayaa u soo baxay tartanka ragga ee 100 m ee qaabka xorta ah
Olombikada Xagaaga ee 2004 ee Athens, isagoo ka helay FINA meel caalami ah, waqtiga gelitaanka ee 57.73. Wuxuu tartan kula jiray lix dabaalyahan oo kale heerka koowaad, oo uu ku jiro Mumtaz Ahmed oo 34 jir ah oo reer Pakistan ah. Wuxuu ku tartamay kaalinta shanaad 58.26, in kabadan nus ilbiriqsi (0.50) waqtigiisa gelitaanka. Dyachkov wuxuu ku guuldareystay inuu u gudbo semi-finalka, maadaama uu kaalinta toddoba iyo lixdanka ka galay guud ahaan 71 dabaasha ee horudhaca ah.