Sergei Zhigalko (Belarusian: ?????? ???????, Syarhei Zhyhalka; born March 28, 1989) is a Belarusian chess grandmaster and a three-time national champion.
He was also European and world champion in his age category.
Zhigalko competed in the FIDE World Cup in 2007, 2011, 2015 and 2017.