Magnus III may refer to:
- Magnus Barefoot, also referred to as Magnus III of Norway (1073–1103)
- Magnus Ladulås, also referred to as Magnus III of Sweden (1240–1290)
- Magnus III of Orkney (1256–1273)
- Magnus III of Mecklenburg-Schwerin (1509–1550)
This disambiguation page lists articles about people with the same name.
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