Crohn's disease (CD) is a chronic relapsing inflammatory disorder of unknown etiology and uncertain pathogenesis with no known cure. CD can involve any segment of the gastrointestinal tract, and oral lesions consistent with granulomatous ulcers are considered an important extra-intestinal manifestation. Oral lesions in the absence of gastrointestinal involvement are rarely reported. We report a case of a 64-year-old man with a history of CD that was in remission for three decades, presenting with painful cobblestone-like ulcerations of the oral mucosa, but without gastrointestinal signs or symptoms. Surgical biopsy of the oral lesions revealed non-necrotizing chronic granulomatous ulcers on histopathologic examination, similar to results from a biopsy of his small intestine three decades previously which established his diagnosis of CD. The patient was successfully treated with potent topical corticosteroids which resulted in resolution of the oral lesions and associated symptoms.