Mārtiņš Karsums (born 26 February 1986) is a Latvian professional ice hockey right winger currently playing for MHk 32 Liptovský Mikuláš of the Slovak Extraliga.

Unhappy with his limited play at the Latvian club team Vilki Rīga, Karsums elected to transfer to the Moncton Wildcats of the QMJHL.

Karsums also dominated the 2004 World Junior Ice Hockey Championship Division I tournament, scoring seven goals and adding six assists for 13 points in five games.

[4] While playing for the Lightning, Karsums scored his first career NHL goal on April 3, 2009, against the New Jersey Devils' Martin Brodeur.

[5] On January 14, 2010, after playing the first half of the season with affiliate, the Norfolk Admirals of the AHL, Karsums was reassigned by the Lightning to HC MVD of the Kontinental Hockey League.

[8][9] Following the 2017–18 season, his fifth with Dynamo, Karsums left the club as a free agent and agreed to a one-year deal to continue in the KHL with HC Spartak Moscow on May 4, 2018.

At the Division I 2004 World Junior Championships, Karsums helped Latvia claim the bronze medal, leading the tournament in scoring with 13 points in 7 games.