Tuberculosis can affect the sacroiliac joint. The involvement has been reported in up to 10 percent of patients with osteoarticular tuberculosis. The onset is usually insidious, and early diagnosis requires a high index of clinical suspicion. Lack of awareness of this presently uncommon form of infection often leads to diagnostic delay and increased morbidity. Early diagnosis and proper treatment with anti-tuberculous medication could obtain a satisfactory functional outcome. We report a case of tuberculous sacroiliitis in a 21 year-old male patient including his clinical presentation, radiographic features and outcome of medical treatment.