Martinš Karsums (born February 26, 1986) is a Latvian professional ice hockey player currently playing as a right winger for HC Spartak Moscow of the Kontinental Hockey League (KHL).
Karsums was selected in the second round, 64th overall, in the 2004 NHL Entry Draft by the Boston Bruins.
He has played in the National Hockey League for the Bruins and the Tampa Bay Lightning.