Valancin Ryhoravic "Vincuk" Viacorka (Belarusian: ???????? ????????? „??????“ ???????, [v?in'tsuk v?a't?orka], Russian: ???????? ??????????? „??????“ ???????, romanized: Valentin Grigorevich „Vintsuk“ Vecherko, born July 7, 1961) is a Belarusian linguist, politician and former leader (1999–2007) of the Belarusian National Front (BNF), a Belarusian opposition party.