James III may refer to:
- James III of Cyprus (1473–1474)
- James III of Majorca (c. 1315–1349)
- James III of Scotland (1451–1488)
- James III, Margrave of Baden-Hachberg (1562–1590)
- James Francis Edward Stuart (1688–1766), pretender who styled himself James III of England and Ireland, and James VIII of Scotland
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