Kronans are a race of aliens from Marvel comics, primarily enemies of Thor they are part of the popular "space invader" subtype of supervillain, where instead of being costumed criminals the villains are depicted as advanced alien warriors intent on world conquest and allow superheroes to fight against large armies without necessarily facing political consequences (as would happen if superheroes fought an army on Earth).

Kronans themselves are conquerors native to the Milky Way Galaxy, having incredibly strong and tough bodies they also utilize advanced alien technology to aid them in their conquest - some notable robots created by the Kronans are the Mechano-Monster and the Mekkanoid.