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|1551 by topic|
|Arts and science|
|Birth and death categories|
|Births – Deaths|
|Establishments and disestablishments categories|
|Establishments – Disestablishments|
|Ab urbe condita||2304|
|Balinese saka calendar||1472–1473|
|English Regnal year||4 Edw. 6 – 5 Edw. 6|
|Chinese calendar||庚戌年 (Metal Dog)
4247 or 4187
— to —
辛亥年 (Metal Pig)
4248 or 4188
|- Vikram Samvat||1607–1608|
|- Shaka Samvat||1472–1473|
|- Kali Yuga||4651–4652|
|Japanese calendar||Tenbun 20
|Minguo calendar||361 before ROC
|Thai solar calendar||2093–2094|
1677 or 1296 or 524
— to —
1678 or 1297 or 525
|Wikimedia Commons has media related to 1551.|
- January–February – Macarius, Metropolitan of Moscow, and Tsar Ivan IV of Russia preside over the reforming Stoglavy Synod ("Hundred-Chapter") church council. A calendar of the saints and an ecclesiastical law code (Stoglav) are introduced.
- January 11 – Ketumati, Burma, is conquered by Bayinnaung.
- May 1 – The Council of Trent reconvenes.
- May 12 – The National University of San Marcos is founded in Lima (Peru), being the first officially established university in the Americas.
- July – Invasion of Gozo: Ottoman Turks and Barbary pirates invade the Mediterranean island of Gozo, enslaving all inhabitants (estimated at 5,000 to 6,000) and transporting them to Tarhuna Wa Msalata (in modern-day Libya).
- August 15 – The Siege of Tripoli ends, with the Knights of Malta surrendering Tripoli to the Ottoman Empire.
- September 21 – The Royal and Pontifical University of Mexico is founded in Mexico City (Mexico), being the second officially established university in the Americas.
- September 30 – Tainei-ji incident: A coup in Yamaguchi, by the military establishment of the Ōuchi clan, forces their lord Ōuchi Yoshitaka to commit suicide, and the city is burned.
- October 11 – John Dudley, Earl of Warwick, de facto Lord Protector of the Kingdom of England, is created Duke of Northumberland.
- Qizilbash forces raid and destroy the cave monastery of Vardzia in Georgia (country).
- In Henan province, China, during the Ming Dynasty, a severe frost in the spring destroys the winter wheat crop. Torrential rains in mid summer cause massive flooding of farmland and villages (by some accounts submerged in a metre of water). In the fall, a large tornado demolishes houses and flattens much of the buckwheat in the fields. Famine victims either flee, starve, or resort to cannibalism. This follows a series of natural disasters in Henan in the years 1528, 1531, 1539, and 1545.
- The fifth outbreak of sweating sickness occurs in England. John Caius of Shrewsbury writes the first full contemporary account of the symptoms of the disease.
- In Slovakia, Guta (modern-day Kolárovo) receives town status.
- Portugal founds a sugar colony at Bahia.
- Juan de Betanzos begins to write his Narrative of the Incas.
- The new edition of the Genevan psalter, Pseaumes octantetrois de David, is pubilshed, with Louis Bourgeois as supervising composer, including the first publication of the hymn tune known as the Old 100th.
- January 5 – Jean Chapeauville, Belgian theologian and historian (d. 1617)
- January 14 – Abu'l-Fazl ibn Mubarak, Grand vizier of the Mughal emperor Akbar (d. 1602)
- January 26 – Robert Dormer, 1st Baron Dormer, English politician (d. 1616)
- February 2 – Nicolaus Reimers, German astronomer (d. 1600)
- March 9 – Alessandro Alberti, Italian painter (d. 1596)
- March 21 – Maria Anna of Bavaria (d. 1608)
- March 30 – Salomon Schweigger, German theologian (d. 1622)
- April 9 – Peter Monau, German physician (d. 1588)
- April 30 – Jacopo da Empoli, Italian painter (d. 1640)
- May 2 – William Camden, English historian (d. 1623)
- May 8 – Thomas Drury, English government informer and swindler (d. 1603)
- May 17 – Martin Delrio, Flemish theologian and occultist (d. 1608)
- September 19 – King Henry III of France (d. 1589)
- October 4 – Philip VI, Count of Waldeck (1567–1579) (d. 1579)
- October 8 – Giulio Caccini, Italian composer (d. 1618)
- October 26 – Charlotte de Sauve, French courtesan (d. 1617)
- November 11 – Giovanni I Cornaro, Doge of Venice (d. 1629)
- date unknown
- February 4 – John V, Prince of Anhalt-Zerbst, Prince of Anahlt-Dessau (1516–1544) and Anhalt-Zerbst (1544–1551) (b. 1504)
- February 28 – Martin Bucer, German Protestant reformer (b. 1491)
- April 6 – Joachim Vadian, Swiss humanist (b. 1484)
- April 8 – Oda Nobuhide, Japanese warlord (b. 1510)
- May 8 – Barbara Radziwiłł, queen of Sigismund II of Poland (b. 1523)
- May 17 – Shin Saimdang (b. 1504)
- May 18 – Domenico di Pace Beccafumi, Italian painter (b. 1486)
- June 24 – Charles II de Croÿ, Belgian duke (b. 1522)
- July – Adriaen Isenbrandt, Flemish painter (b. 1490)
- July 13 – John Wallop, English soldier and diplomat (b. 1490)
- July 14 – Henry Brandon, 2nd Duke of Suffolk (b. 1535)
- August 8 – Fray Tomás de Berlanga, Bishop of Panama (b. 1487)
- August 12 – Paul Speratus, German Lutheran (b. 1484)
- August 26 – Margaret Leijonhufvud, queen of Gustav I of Sweden (b. 1516)
- September 30 – Ōuchi Yoshitaka, Japanese warlord (b. 1507)
- November 20 – Hindal Mirza, Mughal Empire emperor (b. 1519)
- date unknown