Klim Sergeyevich Kostin (born 5 May 1999) is a Russian professional ice hockey winger for the Detroit Red Wings of the National Hockey League (NHL)..
Considered a top prospect for the 2017 NHL Entry Draft, Kostin was selected 31st overall by the St. Louis Blues, and made his NHL debut with them in 2019. Kostin previously played for Dynamo Moscow and Avangard Omsk of the KHL. Internationally Kostin has played for the Russian national junior team at several tournaments.
On 8 March 2024, Kostin was traded to the San Jose Sharks in exchange for Radim Šimek and a 2024 seventh-round pick.