|Ab urbe condita||2308|
|Balinese saka calendar||1476–1477|
|English Regnal year||1 Ph. & M. – 2 Ph. & M.|
|Chinese calendar||甲寅年 (Wood Tiger)|
4251 or 4191
— to —
乙卯年 (Wood Rabbit)
4252 or 4192
|- Vikram Samvat||1611–1612|
|- Shaka Samvat||1476–1477|
|- Kali Yuga||4655–4656|
|Japanese calendar||Tenbun 24 / Kōji 1|
|Minguo calendar||357 before ROC|
|Thai solar calendar||2097–2098|
1681 or 1300 or 528
— to —
1682 or 1301 or 529
|Wikimedia Commons has media related to 1555.|
- January 22 – The Kingdom of Ava in Upper Burma falls.
- February 2 – The Diet of Augsburg begins.
- February 4 – John Rogers, burned at the stake in London, becomes the first Protestant martyr under Mary I of England.
- February 8 – Laurence Saunders becomes the second Marian Protestant martyr in England, being led barefoot to his execution by burning at the stake.
- February 9 – Rowland Taylor, Rector of Hadleigh, Suffolk, and John Hooper, deposed Bishop of Gloucester, are burned at the stake in England.
- April 10 – Pope Marcellus II succeeds Julius III as the 222nd pope. He will reign for 22 days.
- April 17 – After 18 months of siege, the Republic of Siena surrenders to the Florentine–Imperial army.
- May 23 – Pope Paul IV succeeds Marcellus II, as the 223rd pope.
- May 25 – Jeanne d'Albret succeeds Henri II, on the Navarrese throne.
- June 1 – The Treaty of Amasya between the Ottoman Empire and Safavid Persia concludes the Ottoman–Safavid War (1532–1555).
- July 12 – Pope Paul IV creates the Roman Ghetto, the first Jewish ghetto in Rome.
- September 25 – The Peace of Augsburg is signed between Charles V, Holy Roman Emperor, and the Lutheran Schmalkaldic League, establishing the principle Cuius regio, eius religio, that is, rulers within the Empire can choose the religion of their realm.
- October 16
- October 25 – Charles V abdicates as Holy Roman Emperor and is succeeded by his brother Ferdinand.
- Russia breaks a 60-year-old truce with Sweden by attacking Finland.
- Humayun resumes the rule of the Mughal Empire.
- Bairam Khan defeats Hindu forces at the Second Battle of Panipat.
- The Adal Sultanate in the Horn of Africa collapses.
- The Muscovy Company is chartered in England to trade with Muscovy, and Richard Chancellor negotiates with the Tsar.
- English captain John Lok returns from Guinea, with five Africans to train as interpreters for future trading voyages.
- Richard Eden publishes The Decades of the Newe Worlde or West India, a translation into English of parts of Pietro Martire d'Anghiera's De orbe novo decades, Gonzalo Oviedo's Natural hystoria de las Indias and others including the first recorded use in English of the country name 'China'.
- Negro – the Spanish term for black person – is coined.
- Gresham's School is founded by Sir John Gresham, at Holt, Norfolk in England.
- William Annyas becomes the Mayor of Youghal, Ireland, the first Jew to hold such a position in Ireland.
- John Dee is charged, but cleared, of treason in England.
- Orlande de Lassus' first book of madrigals is published, in Antwerp.
- Lorenzo de' Medici orders a violin from Andrea Amati of Cremona.
- Ripon Grammar School re-established
- January 26 – Charles II, Lord of Monaco (d. 1589)
- February 25 – Alonso Lobo, Spanish musician (d. 1617)
- March 18 – François, Duke of Anjou, youngest son of Henry II of France and Catherine de' Medici (d. 1584)
- March 21 – John Leveson, English politician (d. 1615)
- March 31 – Elizabeth Stuart, Countess of Lennox, English countess (d. 1582)
- April 21 – Ludovico Carracci, Italian painter (d. 1619)
- April 28 – Karl Friedrich of Jülich-Cleves-Berg, heir apparent of Jülich-Cleves-Berg (d. 1575)
- May 5 – Queen Uiin, Korean royal consort (d. 1600)
- May 9 – Jerónima de la Asunción, founder of the first Catholic monastery in Manila, the Monastery of Santa Clara (d. 1630)
- May 29 – George Carew, 1st Earl of Totnes, English earl, general and administrator (d. 1629)
- June 11 – Lodovico Zacconi, Italian composer and music theorist (d. 1627)
- June 13 – Giovanni Antonio Magini, Italian mathematician, cartographer and astronomer (d. 1617)
- June 16 – Duke Otto Henry of Brunswick-Harburg, Hereditary Prince of Brunswick-Lüneburg-Harburg (d. 1591)
- July – Henry Garnet, English Jesuit (d. 1606)
- July 6 – Louis II, Cardinal of Guise, French Catholic cardinal (d. 1588)
- July 17 – Richard Carew, English scholar (d. 1620)
- August 1 – Edward Kelley, English spirit medium (d. 1597)
- September 3 – Jan Zbigniew Ossoliński, Polish nobleman (d. 1628)
- September 21 – John Thynne, English landowner and politician (d. 1604)
- September 23 – Louise de Coligny, princess consort of Orange (d. 1620)
- September 28 – Henri de La Tour d'Auvergne, vicomte de Turenne, duc de Bouillon, Marshal of France (d. 1623)
- October 6 – Ferenc Nádasdy, Hungarian noble (d. 1604)
- October 12 – Peregrine Bertie, 13th Baron Willoughby de Eresby, English baron (d. 1601)
- November 8 – Nyaungyan Min king of Burma (d. 1605)
- December 4 – Heinrich Meibom, German historian and poet (d. 1625)
- December 27 – Johann Arndt, German Lutheran theologian (d. 1621)
- date unknown
- Lancelot Andrewes, English clergyman and scholar (d. 1626)
- Adam Sędziwój Czarnkowski, Polish nobleman (d. 1628)
- Samuel Eidels, Polish Jewish rabbi and Talmudist (d. 1631)
- Joshua Falk, Polish Jewish rabbi and commentator (d. 1614)
- Elijah Loans, German Jewish rabbi and kabbalist (d. 1636)
- François de Malherbe, French poet (d. 1628)
- Okudaira Sadamasa, Japanese nobleman (d. 1615)
- Konishi Yukinaga, Japanese Christian daimyō (d. 1600)
- Moderata Fonte, Italian poet, writer and philosopher (d. 1592)
- Maria van Schooten, Dutch war heroine (d. 1573)
- Naresuan, King of Ayutthaya (d. 1605)
- January 14 – Jacques Dubois, French anatomist (b. 1478)
- February 4 – John Rogers, English clergyman (burned at the stake) (b. c. 1500)
- February 8 – Laurence Saunders, English clergyman (burned at the stake)
- February 9
- February 17 – Giuliano Bugiardini, Italian painter (b. 1475)
- March 14 – John Russell, 1st Earl of Bedford (b. 1485)
- March 23 – Pope Julius III (b. 1487)
- March 27 – Al-Mutawakkil Yahya Sharaf ad-Din, Imam of the Zaidi state in Yemen (b. 1473)
- April 12 – Queen Joanna of Castile (b. 1479)
- April 18 – Polydore Vergil, English historian (b. 1470)
- May 1 – Pope Marcellus II (b. 1501)
- May 21 – George III, Landgrave of Leuchtenberg (b. 1502)
- May 25
- June 10 – Elizabeth of Denmark, Electress of Brandenburg (1502–1535) (b. 1485)
- September 8 – Thomas of Villanova, Spanish Roman Catholic bishop and saint (b. 1488)
- October 5 – Edward Wotton, English zoologist (b. 1492)
- October 9 – Justus Jonas, German Protestant reformer (b. 1493)
- October 16
- October 26 – Olympia Fulvia Morata, Italian classical scholar (b. 1526)
- November 4 – Agnes of Hesse, German nobleman, by marriage, Princess of Saxony (b. 1527)
- November 12
- November 21 – Georgius Agricola, German scientist (b. 1490)
- December – Stanisław Kostka, Polish noble (b. 1487)
- December 9 – Elisabeth of Culemborg, German noble (b. 1475)
- E. Goldsmid (ed.), The Principal Navigations, Voyages, Traffiques and Discoveries of the English Nation, collected by Richard Hakluyt, Preacher, Vol. III: North-Eastern Europe and Adjacent Countries, Part II: The Muscovy Company and the North-Eastern Passage (E. & G. Goldsmid, Edinburgh 1886), pp. 101-112.
- Hadfield, Andrew (2004). "Eden, Richard (c.1520–1576)". Oxford Dictionary of National Biography. Oxford University Press. doi:10.1093/ref:odnb/8454. Retrieved December 12, 2011. (subscription or UK public library membership required)
- Ireland. Dept. of Foreign Affairs (1987). Ireland today. Information Section, Dept. of Foreign Affairs. Retrieved June 9, 2012.
- "Julius III | pope". Encyclopedia Britannica. Retrieved May 3, 2019.