Sergey Kovalchuk may refer to: Serghei Covalciuc (born 1982), Moldovan footballer Syarhey Kavalchuk (born 1978), Belarusian footballer Sergey Kovalchuk (politician) (born 1968), Belarusian politician Sergey Petrovich Kovalchuk (born 1973), Belarusian footballer and coach