Rat Ogres are a type of skaven from Warhammer Fantasy.

These creatures are the result of the vile experiments of the skaven Clan Moulder (a skaven Greater Clan specializing in mutating and breeding horrific beasts of war).

Rat Ogres are massive, hulking, near mindless and bloodthirsty creatures that are often used as war-beasts whenever the skaven do battle with the surface-races (or with each other).