This article is about the year 1611.
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1611 (MDCXI) was a common year starting on Saturday (dominical letter B) of the Gregorian calendar and a common year starting on Tuesday (dominical letter F) of the Julian calendar, the 1611th year of the Common Era (CE) and Anno Domini (AD) designations, the 611th year of the 2nd millennium, the 11th year of the 17th century, and the 2nd year of the 1610s decade. Note that the Julian day for 1611 is 10 calendar days difference, which continued to be used from 1582 until the complete conversion of the Gregorian calendar was entirely done in 1929.
- February 27 – Sunspots are observed by telescope by Frisian astronomers Johannes Fabricius and David Fabricius and Johannes publishes the results of these observations in De Maculis in Sole observatis in Wittenberg later this year. Such early discoveries are overlooked however, and the first sighting is claimed a few months later by Galileo Galilei and Christoph Scheiner.
- March 4 – George Abbot is enthroned as Archbishop of Canterbury.
- March 9 – Yemana Kristos, brother of Emperor of Ethiopia Susenyos I, ends the rebellion of Melka Sedeq in the Battle of Segaba in Begemder.
- April 4 – Denmark declares war on Sweden, then captures Kalmar.
- April 28 – The Colegio de Nuestra Señora del Santísimo Rosario is established in Manila, the Philippines (later renamed Colegio de Santo Tomas, now known as the University of Santo Tomas).
- May 2 – The Authorized King James Version of the Bible is published for the first time in London, England, printed by Robert Barker.
- May 9 – In Japan, sixteen-year-old Emperor Go-Mizunoo succeeds Emperor Go-Yōzei.
- June 22 – The English explorer and sea captain Henry Hudson, his teenage son John, and six crewmen are set adrift in or near Hudson Bay after a mutiny on his ship Discovery. They are never seen again.
- January 5 – Tsarevich Ivan Dmitriyevich, son of False Dmitry II (d. 1614)
- February 5 (bapt.) – Philip Sherman, English-born founder of Rhode Island (d. 1687)
- January 28 – Johannes Hevelius, astronomer (d. 1687)
- May 16 – Pope Innocent XI (d. 1689)
- July 16 – Archduchess Cecilia Renata of Austria, Queen of Poland (d. 1644)
- September 1 – William Cartwright, English dramatist (d. 1643)
- September 8 – Johann Friedrich Gronovius, German classical scholar (d. 1671)
- September 11 – Henri de la Tour d'Auvergne, Vicomte de Turenne, Marshal of France (d. 1675)
- November 1 – François-Marie, comte de Broglie, Italian-born French commander (d. 1656)
- date unknown
- probable – Charles de Batz-Castelmore d'Artagnan, French count and musketeer, on whom the fictional D'Artagnan from the novel The Three Musketeers is based (d. 1673)
- February 12 – Jodocus Hondius, cartographer (b. 1563)
- February 26 – Antonio Possevino, papal legate to Russia
- March 5 – Shimazu Yoshihisa, Japanese warlord and samurai (b. 1533)
- June 8 – Jean Bertaut, French poet (b. 1552)
- July 26 – Horio Yoshiharu, Japanese warlord (b. 1542)
- August – Antoni Clarassó i Terès, Spanish priest
- August 2 – Katō Kiyomasa, Japanese warlord and samurai (b. 1562)
- August 27 – Tomás Luis de Victoria, Spanish composer (b. c. 1548)
- October 3 – Charles of Lorraine, Duke of Mayenne, French military leader (b. 1554)
- October 30 – King Charles IX of Sweden (b. 1550)
- date unknown