Magnus I
Magnus I may refer to:
- Magnus the Good, King of Norway and King of Denmark
- Magnus Erlendsson, Earl of Orkney
- Magnus the Strong, King of Sweden
- Magnus Ladulås, King of Sweden
- Magnus, Duke of Saxony
- Magnus I, Duke of Saxe-Lauenburg from the Ascanian House
- Magnus I, Duke of Mecklenburg
- Magnus, Duke of Östergötland, prince of Sweden