Sergey Ashihmin (Russian: Серге́й Ашихмин; is a Russian-born Kyrgyzstani former swimmer, who specialized in sprint freestyle events.

While playing for the Russian senior team, Ashihmin also earned a silver medal, along with Denis Pimankov, Dmitry Chernyshov, and double Olympic champion Alexander Popov, in the 4×100 m freestyle relay at the 1999 European Aquatics Championships in Istanbul, Turkey.

He failed to reach the top 16 final in the 100 m freestyle, finishing in twenty-ninth place with a time of 51.07.

[3][4][5] In 1998, Ashihmin shared silver medals with Popov, Pimankov, and Roman Yegorov for Russia in the sprint freestyle relay (3:17.99), when the U.S. hosted again the Goodwill Games in New York City.

[9][10] Two days later, in the 50 m freestyle, Ashihmin challenged seven other swimmers in heat four, including Kazakhstan's top sprinter Sergey Borisenko.