| March 27 | Charles I, King Of England, Scotland and Ireland, ascends English throne |
| April 4 | Viceroy Frederik Henry marries Amalia countess von Solms-Braunfels |
| April 7 | Albrecht von Wallenstein appointed German supreme commander |
| May 1 | Portuguese and Spanish expedition recaptures Salvador (Bahia) |
| May 1 | Prince Frederik Henry appointed viceroy of Holland |
| May 11 | Boers besiege Frankenburg estate in Upper-Austria |
| May 15 | 16 rebellious farmers hanged in Vocklamarkt Upper-Austria |
| June 2 | Prince Frederik Henry sworn in as viceroy of Holland/Zealand |
| June 5 | Spanish troops under Spinola conquer Breda |
| June 13 | English king Charles I marries French princess Henriette |
| August 6 | Earl Earnest Casimir appointed as viceroy of Groningen |
| August 16 | Earnest Casimir of Nassau-Dietz appointed viceroy of Drenthe |
| September 13 | 16 Rabbis (including Isiah Horowitz) are imprisoned in Jerusalem |
| September 24 | Dutch attack San Juan, Puerto Rico |
| October 8 | Admiral George Villiers' fleet sails from Plymouth to Cadiz |
| December 9 | Netherlands and England sign military treaty |
