Siwardus was a Bishop of Uppsala in the 1140s. He was probably the same person as a certain Sverinius, who is mentioned as the first Bishop of Uppsala in an early 15th century Incerti scriptorts Sueci chronicon primorumin ecclesia Upsalensi archiepiscoporum, chronicle of Uppsala archbishops. Historical sources mention Siwardus in 1142 and 1143.

Siwardus apparently died in a monastery in Oldenburg in 1159 after being exiled from Uppsala by local heathens sometime earlier. There were plans to have him canonized as a saint, which never took place.

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