|Born|| March 14, 1981
|Peak rating||2674 (November 2010)|
Sergey Fedorchuk (Ukrainian: Сергій Федорчук, Serhiy Fedorchuk; born 14 March 1981) is a Ukrainian chess grandmaster (2002).
In 1995 he won the European under-14 championship. In 2006 he won a rapid tournament held in Banyoles and shared first place with Gabriel Sargissian and Tigran L. Petrosian in the 8th Dubai Open. In 2008 he tied for 1st-8th with Vugar Gashimov, David Arutinian, Yuriy Kryvoruchko, Konstantin Chernyshov, Andrei Deviatkin, Vasilios Kotronias and Erwin L'Ami in the Cappelle-la-Grande Open tournament. In 2009 he tied for 1st-2nd with Murtas Kazhgaleyev in the Paris City Chess Championship and came first at Nantes. He won the Paris Championship of 2012. Fedorchuk tied for 1st-8th with Sanan Sjugirov, Parimarjan Negi, Maxim Rodshtein, Eric Hansen, Vlad-Cristian Jianu, Alexei Fedorov and Yuri Vovk in the 2013 Cappelle-la-Grande Open. In February 2014, Fedorchuk tied for first with Baadur Jobava and Mikhailo Oleksienko, placing second on tiebreak, in the David Bronstein Memorial in Minsk. Soon afterwards he won the 2014 Vladimir Petrov Memorial, a rapid tournament held in Jūrmala, Latvia.
Fedorchuk played for the Ukrainian team on the reserve board in the 2013 European Team Chess Championship.