| January 29 | Sermon of Constanz: Zwingli defends 67 Schlussreden |
| May 1 | Danish king Christian III arrives in Veere |
| June 6 | Gustavus I becomes king of Sweden (Swedish National Day) |
| June 12 | Frisian rebel leader Jancko Douwama arrested |
| September 19 | Emperor Charles I and England sign anti-French covenant |
| October 27 | English troops occupy Montalidier France |
| November 19 | Giulio de' Medici chosen as Pope Clemens VII |
| November 30 | Amsterdam bans assembly of heretics |