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This article is about the year 1054.
|Centuries:||10th century – 11th century – 12th century|
|Decades:||1020s 1030s 1040s – 1050s – 1060s 1070s 1080s|
|Years:||1051 1052 1053 – 1054 – 1055 1056 1057|
|1054 by topic|
|Lists of leaders|
|Birth and death categories|
|Births – Deaths|
|Establishments and disestablishments categories|
|Establishments – Disestablishments|
|Ab urbe condita||1807|
|Bahá'í calendar||−790 – −789|
|English Regnal year||N/A|
|Chinese calendar||癸巳年 (Water Snake)
3750 or 3690
— to —
甲午年 (Wood Horse)
3751 or 3691
|- Vikram Samvat||1110–1111|
|- Shaka Samvat||976–977|
|- Kali Yuga||4155–4156|
|Japanese calendar||Tengi 2
|Minguo calendar||858 before ROC
|Thai solar calendar||1597|
|Wikimedia Commons has media related to 1054.|
- February – Battle of Mortemer: The Normans defeat a French army as it is caught pillaging and plundering. King Henry I of France withdraws his main army from Normandy as a result.
- April 30 – Rosdalla, Kilbeggan Ireland: Earliest known European tornado.
- July 4 – The SN 1054 supernova is recorded by the Chinese, Arab and possibly Native Americans near the star ζ Tauri. For 23 days it remains bright enough to be seen in daylight. Its remnants form the Crab Nebula (NGC 1952).
- July 16 – Cardinal Humbertus, a representative of Pope Leo IX, and Michael Cerularius, Patriarch of Constantinople, decree each other excommunication. Most historians look to this act as the final step in the initiation of the Great Schism between the Roman Catholic and Orthodox Christian Churches. In 1965, those excommunications are rescinded by Pope Paul VI and Patriarch Athenagoras when they meet in the Second Vatican Council. However, to this day each church claims to be the One Holy Catholic and Apostolic Church and each denies the other's right to that name. (See East-West Schism)
- July 27 – Siward, Earl of Northumbria invades Scotland to support Malcolm Canmore against Macbeth, who usurped the Scottish throne from Malcolm's father, King Duncan. Macbeth is defeated at Dunsinane.
- Lý Nhật Tôn, third king of the Lý Dynasty, begins to rule in Vietnam and changes the country's official name to Đại Việt.
- February 20 – Yaroslav the Wise, prince of Kievan Rus
- April 19 – Pope Leo IX (b. 1002)
- September 24 – Hermannus Contractus
- Journal of Astronomy, part 9, chapter 56 of Sung History (Sung Shih) first printing, 1340. facsimile on the frontispiece of Misner, Thorne, Wheeler Gravitation, 1973.
- Levtzion, Nehemia; Hopkins, John F.P., eds. (2000), Corpus of Early Arabic Sources for West Africa, New York: Marcus Weiner Press, ISBN 1-55876-241-8. First published in 1981.