This paper reports five cases of a heretofore unreported condition of the gingiva named reticular mandibular gingival ridges. Occurring in middle-aged males, macroscopically, they are bilateral ridges on the mandibular attached gingivae resembling rugae and having a reticular pattern that may be mistaken for lichen planus. Microscopically, they are formed of fibrous tissue with vessels that have a minimal perivascular infiltrate; the epithelium has extension of rete ridges. Of unknown etiology, the condition does not appear to change, is innocuous and does not require treatment.