Enterococcus raffinosus is a bacterial species of the Gram-positive genus Enterococcus, named for its facultative anaerobic metabolism, including the ability to ferment the trisaccharide raffinose. This mesophilic microaerophile has optimal growth at 37°C in Columbia Blood Medium. It has an ovoid morphology categorized as coccal with arrangement singly, in pairs, or short chains.