| Native Name: | Серге́й Перунин |
| Birth Date: | 19 July 1988 |
| Birth Place: | Volgograd, Russia |
| Height: | 1.85m (06.07feet) |
| Weight: | 76kg (168lb) |
| Sport: | Swimming |
| Club: | Volga, Volgograd |
Sergey Perunin (Russian: Серге́й Перунин; born 19 July 1988) is a Russian swimmer who won a silver medal in the 4 × 200 m freestyle relay at the 2009 World Aquatics Championships. Next year he won a gold medal in the same event at the 2010 European Aquatics Championships setting a new European record.
In August 2012 he married Larisa Ilchenko, multiple open water swimming champion.