William (929 - 2 March 968) was the Archbishop of Mainz from 954 until 968.

William was a son of King Otto I the Great of Germany. On 17 December 954 he was appointed the Archbishop of Mainz following the death of the rebellious former Archbishop Frederick. William received confirmation from Pope Agapetus II, and also the title of Apostolic Vicar of Germany, a title which made the Archbishops of Mainz the Pope's deputies in Germany and granted the archdiocese of Mainz the title of "Holy See". From his father William also received the title of "Arch-Chaplain of the Empire". William died in 968 and was buried in the Abbey of St Alban.

Preceded by:


Succeeded by:

Frederick Archbishop of Mainz
954 - 968
Hatto II