Adrian III (also known as Hadrian III) was Pope from May 17, 884 to September, 885. He was born at Rome. He died in September, 885, at Modena, on a journey to Worms, in modern Germany.

His brief pontificate came during troubled times. He died en route to the Diet of Worms after being summoned by the Frankish King Charles III, The Fat, to settle the succession to the empire and discuss the rising Saracen power. The motives for his veneration are practically unknown, but he was noted for having aided the Romans during a famine. His cult was confirmed in 1891, and his feast day is 8 July.