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1650 (MDCL) was a common year starting on Saturday of the Gregorian calendar and a common year starting on Tuesday of the Julian calendar, the 1650th year of the Common Era (CE) and Anno Domini (AD) designations, the 650th year of the 2nd millennium, the 50th year of the 17th century, and the 1st year of the 1650s decade. As of the start of 1650, the Gregorian calendar was 10 days ahead of the Julian calendar, which remained in localized use until 1923.
- August 13 – Colonel George Monck forms Monck's Regiment of Foot, forerunner of the Coldstream Guards.
- September 3 – Third English Civil War: Battle of Dunbar (1650) – Parliamentarian forces under Oliver Cromwell defeat a Scottish army, commanded by David Leslie.
- September 27 – The Kolumbo volcano on Santorini experiences a massive eruption (VEI 6).
- September 29 – Henry Robinson opens his Office of Addresses and Encounters, a form of employment exchange, in Threadneedle Street, London.
- November 4 – William III of Orange becomes Prince of the House of Orange at the moment of his birth, succeeding his father, who had died a few days earlier. He does not become stadtholder, so the United Provinces becomes a true republic.
- December 14 – Anne Greene is hanged at Oxford Castle in England for infanticide, having concealed an illegitimate stillbirth. The following day she revives in the dissection room and, being pardoned, lives until 1665.
- December 25 – Thomas Cooper, former Usher of Gresham's School, England, is hanged as a Royalist rebel.
беларуская (тарашкевіца): 1650
srpskohrvatski / српскохрватски: 1650