Year 1655 (MDCLV) was a common year starting on Friday (link will display the full calendar) of the Gregorian calendar (or a common year starting on Monday of the 10-day slower Julian calendar).
Events of 1655
January - June
July - December
- The Bibliotheca Thysiana is erected, the only surviving 17th century example in the Netherlands of a building designed as a library.
See also .
- January 5 - Pope Innocent X (b. 1574)
- February 25 - Daniel Heinsius, Flemish scholar (b. 1580)
- April 6 - David Blondel, French Protestant clergyman (b. 1591)
- April 30 - Eustache Le Sueur, French painter (b. 1617)
- June 27 - Eleonore Gonzaga, wife of Ferdinand II, Holy Roman Emperor (b. 1598)
- July 15 - Girolamo Rainaldi, Italian architect (b. 1570)
- July 28 - Cyrano de Bergerac, French soldier and writer (b. 1619)
- July 28 - Suzuki Shōsan, Japanese Samurai (b. 1579)
- August 10 - Alfonso de la Cueva, marqués de Bedmar, Spanish cardinal and diplomat (b. 1572)
- September 7 - François Tristan l'Hermite, French dramatist (b. 1601)
- October 16 - Joseph Solomon Delmedigo, Italian physician, mathematician, and music
theorist (b. 1591)
See also .