Magnus Haraldsson may refer to:

• Maccus mac Arailt (fl. 971–974), King of the Isles, also known as Magnus Haraldsson
• Magnus II of Norway (1048–1069), King of Norway, also known as Magnus Haraldsson
• Magnus Haraldsson of Norway (c. 1135 – c. 1145), King of Norway
• Magnus Haraldsson (bishop of Skara), 1522–1529, see Diocese of Skara#History

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