Viktor Ivanovych Dyak (Ukrainian: Віктор Іванович Дяк; born 4 June 1971) is a former professional Ukrainian football and futsal forward who currently works as a coach in the academy of Shakhtar Donetsk. Supposedly, in Diak also played for the Russian club FC Nemkom Krasnodar in the Russian Second League. Diak became the second highest scorer after Serhiy Chuichenko when he scored 21 goals for FC Shakhtar Makiivka during the 1995–96 Ukrainian First League season. In 2000–07 Diak also participated in futsal competitions playing for several futsal teams out of the Donbas region.