Malsumis is an extremely malevolent spirit or god in Abenaki mythology, an Algonquian people of northeastern North America.

According to legend, after Tabaldak created humans, the dust from his hand created Gluskab and some versions say that he also created Gluskab's twin brother, Malsumis. Tabaldak gave Gluskab the power to create a good world. Malsumis, on the other hand, did the opposite, and still seeks evil to this day. Malsumis is the evil brother of Gluskab, who was created form the dust of the creation of man. While he and Gluskab both had the power to do good, Malsumis used his power for evil and trickery, like putting thorns on plants, or giving insects their sting. While Gluskab protects man, Malsumis uses his power to plot the end of man to this very day.

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