Sergey Punko or Sergei Punko (born in Navapolatsk on 10 January 1981) is a formerly Belarusian, now Russian Paralympic swimmer. He was born with a progressive eye disease, but had normal sight as a child. He started swimming at age 10, and competed nationally and internationally in able-bodied competition until he was 21. By that time, he had less than 5% vision. Classified S12, he began swimming in disability meets in 2002. He quickly broke long-standing world records, and was named World Disabled Swimmer of the Year in 2003.
AS of the 2012 Paralympic Games he has won four gold medals, six silver, and three bronze medals. At the 2012 Summer Paralympics he won a gold and silver medals for Russia.
As of February 2013, Punko holds S12 long course world records in 200, 400 and 800 metre freestyle and 200 metre butterfly events.