Sergey Andreyevich Kosov (; born 31 January 1986) is a former Russian professional footballer.
In 2010, he made an excellent debut for FK à  iauliai and was one of the best goalkeepers in Lithuanian A Lyga. After the expiry of the contract on 15 November 2010, player moved to FK Jà «rmala-VV, playing in the Latvian Higher League. After playing 8 league games he was released.