Jan III
# 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
