Oileus rimator is a beetle of the family Passalidae. It is found in Mexico, on both sides of the Isthmus of Tehuantepec at elevations of .
Adult Oileus rimator measure in length. It is a species, in contrast to some of its congeners.
In a nutritional study of edible insects, Oileus rimator larvae were found to be 21% protein, compared to 80% for adult female gypsy moths (Lymantria dispar). Another study found that the larvae contained 36% crude protein.