William of Roskilde (Danish: Vilhelm, German: Wilhelm, Latin: Wilhelmus; died 8 May or 10 May c. 1074)[1] was a Danish prelate of the Roman Catholic Church who served as the Bishop of Roskilde in Denmark from about 1060.

[2] While the Gesta Danorum by Saxo Grammaticus written a century later frames him as Anglo-Saxon who previously served Cnut the Great in England as his priest and clerk.

[4] According to Saxo Grammaticus, William had a close relationship with King Sweyn II that allowed him to secure valuable land and power for his bishopric.

He also retells an appropriated fictional story based on a legend with Saint Ambrose and Theodosius I originally written by Paulinus the Deacon about murder and penitence to explain their relationship development.

[6] William of Roskilde's date of canonization is unknown,[b] but his memorial is observed by the Roman Catholic Church on September 2.