A 10-month-old boy was admitted with ptosis on the left eyelid, which rapidly occurred following a disease with rash about 20 days before admission to our hospital. By history, none of the vaccinations had been performed. On physical examination, his vital signs were stable, and he had marasmus. Isolated left oculomotor nerve palsy was diagnosed. Cranial magnetic resonance imaging was normal. Serum IgM antibody to measles virus was positive. Oculomotor nerve palsy markedly improved on the 15th day of follow-up, and complete improvement was noted on the second month of follow-up. To our knowledge, this is the first case of oculomotor nerve palsy following measles.