Jan III

Jan III may refer to:

• Jan III van Diest (died 1340)
• Jan III of Oświęcim (1366–1405)
• Jan III van Montfoort (c. 1448 – 1522)
• John III, Lord of Bergen op Zoom (1452–1532)
• John III Sobieski (1629–1696)

• Jan III Sobieski High School in Kraków