A species of obligately anaerobic, Gram-negative, rod shaped bacteria assigned to the phylum Bacteroidetes. This species is nonmotile, non-spore forming, nonpigmented, indole and catalase negative, ferments dextrin, fructose, glucose, lactose, maltose, mannose, raffinose, and starch, but does not digest milk or meat, and does not reduce nitrate. P. oris is found in chickens and the human gingiva where it is associated with several types of oral infections, as well as systemic infections.

Any bacterial organism that can be assigned to the species Prevotella oris.