John VI may refer to:
- Pope John VI, Pope from 701 to his death in 705
- Ecumenical Patriarch John VI of Constantinople, Patriarch from 712 to 715
- John VI Sarigta, Syriac Patriarch of Antioch (965–985)
- John VI of Naples, Duke from c. 1097 to c. 1120
- John VI the Affluent, Catholicos of the Holy See of Cilicia (1203–1221)
- John VI Kantakouzenos (1292–1383), Byzantine Emperor from 1347 to 1354
- John VI, Duke of Brittany (1389–1442)
- John VI, Duke of Mecklenburg (1439–1474)
- John VI, Count of Nassau-Dillenburg (1535–1606)
- John VI, Prince of Anhalt-Zerbst (1621–1667)
- John VI of Portugal (1767–1826), King of the United Kingdom of Portugal, Brazil and the Algarves (1816–1825), King of Portugal and of the Algarves (1825–1826)
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