Hatto II (died 18 January 970) was the archbishop of Mainz from 968 to 970.
While in office, he built the church of St George on the island of Reichenau, donated heavily to the abbeys of Fulda and Reichenau, and was a patron of the chronicler Regino of Prüm.
| Preceded by William |
Archbishop of Mainz 968–970 |
Succeeded by Rudbrecht |