Andrey Kvassov (Kazakh: Андрей Квассов; born January 16, 1976) is a Kazakhstani-Kyrgyzstani former swimmer, who specialized in sprint and middle-distance freestyle events.

Kvassov made his official debut for Kyrgyzstan at the 1996 Summer Olympics in Atlanta.

[5] On the first day of the Games, Kvassov placed twenty-first for the Kazakhstan team in the 4 × 100 m freestyle relay.

Teaming with Sergey Borisenko, Pavel Sidorov, and Igor Sitnikov in heat three, Kvassov swam a second leg and recorded a split of 52.25, but the Kazakhs settled only for last place in a final time of 3:28.90.

Swimming in heat two, he touched out Cyprus' Alexandros Aresti for a seventh seed by almost a full body length in 1:55.72.