Two brothers with DIDMOAD (Wolfram) syndrome are described. The elder brother is 12 years old and was diagnosed as having diabetes mellitus at five. He later developed optic atrophy. The younger brother is 10 years old. He also has suffered from diabetes mellitus and optic atrophy. Their audiograms showed moderate hearing loss only at 8000 Hz. Auditory brainstem response (ABR) was normal. No vestibular abnormalities were found. In 151 reported cases, including present cases, 17.4 percent have moderate to severe or at least subjective deafness, 45.0 percent have deafness only at high frequency, 6 percent have deafness for which the severity was not described, 13.4 percent have normal hearing, and in 18.1 percent the status of hearing was not mentioned.