Martin Kellerman (born 1973 in Växjö) is a Swedish cartoonist, known for the comic strip Rocky.
He was influenced by American and Swedish underground cartoonists such as Peter Bagge, Max Andersson, Robert Crumb, Harvey Pekar, Joe Matt and Mats Jonsson. Kellerman states that his work resembles "a mixture between really dark comics and commercial stuff like MAD. That's why to [underground cartoonists] I'm considered a commercial artist." The strip was picked up by the free newspaper Metro, and moved from publication to publication because multiple newspapers canceled the strip in response to reader complaints over its profanity and sexual content.