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|Ab urbe condita||2208|
|Balinese saka calendar||1376–1377|
|English Regnal year||33 Hen. 6 – 34 Hen. 6|
|Chinese calendar||甲戌年 (Wood Dog)|
4151 or 4091
— to —
乙亥年 (Wood Pig)
4152 or 4092
|- Vikram Samvat||1511–1512|
|- Shaka Samvat||1376–1377|
|- Kali Yuga||4555–4556|
|Japanese calendar||Kyōtoku 4 / Kōshō 1|
|Minguo calendar||457 before ROC|
|Thai solar calendar||1997–1998|
1581 or 1200 or 428
— to —
1582 or 1201 or 429
|Wikimedia Commons has media related to 1455.|
- January 8 – Pope Nicholas V publishes Romanus Pontifex, an encyclical addressed to King Afonso V of Portugal, which sanctions the conquest of non-Christian lands, and the reduction of native non-Christian populations to 'perpetual slavery' (later there will be a dramatic reversal when, in 1537, the bull Sublimis Deus of Pope Paul III forbids the enslavement of non-Christians).
- February 23 – The Gutenberg Bible is the first book printed with movable type.
- April 8 – Pope Calixtus III succeeds Pope Nicholas V, as the 209th pope.
- Spring – The Wars of the Roses begin in England.
- May 1 – Battle of Arkinholm: Forces loyal to King James II of Scotland defeat the supporters of the Earl of Douglas.
- May 22 – First Battle of St Albans: Richard, Duke of York, defeats and captures King Henry VI of England.
- November 15 – The conflict between Vladislav II of Wallachia and John Hunyadi escalates, so the latter decides to support Vlad the Impaler for the throne of Wallachia, the following year.
- January 9 – William IV, Duke of Jülich-Berg, Count of Ravensberg (d. 1511)
- January 29 – Johann Reuchlin, German-born humanist and scholar (d. 1522)
- February 2 – King John of Denmark, Norway, and Sweden (d. 1513)
- March 3
- March 15 – Pietro Accolti, Italian Catholic cardinal (d. 1532)
- May 16 – Wolfgang I of Oettingen, German count (d. 1522)
- June 1 – Anne of Savoy, Savoy royal (d. 1480)
- July 9 – Frederick IV of Baden, Dutch bishop (d. 1517)
- July 15 – Queen Yun, Korean queen (d. 1482)
- August 2 – John Cicero, Elector of Brandenburg (d. 1499)
- August 15 – George, Duke of Bavaria (d. 1503)
- November 9 – Johann V of Nassau-Vianden-Dietz, Lord of Breda and Stadtholder of Guelders and Zutphen (d. 1516)
- date unknown
- February 18 – Fra Angelico, Italian painter (b. 1395)
- March 24 – Pope Nicholas V (b. 1397)
- April 1 – Zbigniew Oleśnicki, Polish Catholic cardinal and statesman (b. 1389)
- May 1 – Archibald Douglas, Earl of Moray (in battle)
- May 22 (killed at the First Battle of St Albans):
- September 3 – Alonso Tostado, Spanish Catholic bishop
- October 22 – Johannes Brassart, Flemish composer
- October 28 – Guillaume-Hugues d'Estaing, French Catholic cardinal
- December 1 – Lorenzo Ghiberti, Italian sculptor and metal smith (b. 1378)
- December 2 – Isabel of Coimbra, queen of Portugal (b. 1432)
- Hourihane, Colum (2012). The Grove Encyclopedia of Medieval Art and Architecture. OUP USA. p. 217. ISBN 9780195395365.
- "Nicholas V | Vatican Library & Dum Diversas". Encyclopedia Britannica. Retrieved May 6, 2019.