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|Centuries:||11th century – 12th century – 13th century|
|Decades:||1090s 1100s 1110s – 1120s – 1130s 1140s 1150s|
|Years:||1120 1121 1122 – 1123 – 1124 1125 1126|
|1123 by topic|
|State leaders – Sovereign states|
|Birth and death categories|
|Births – Deaths|
|Establishments and disestablishments categories|
|Establishments – Disestablishments|
|Art and literature|
|1123 in poetry|
|Ab urbe condita||1876|
|English Regnal year||23 Hen. 1 – 24 Hen. 1|
— to —癸卯年十二月十二日
|- Vikram Samvat||1179–1180|
|- Shaka Samvat||1045–1046|
|- Kali Yuga||4224–4225|
|- Ǹrí Ìgbò||123–124|
|Juche calendar||N/A (before 1912)|
|Julian calendar||1123 MCXXIII|
|Minguo calendar||789 before ROC
|Thai solar calendar||1666|
|Wikimedia Commons has media related to: 1123|
By area 
- August 9 – Failure of a Norman campaign in North Africa, the Norman troops are massacred near Mahdia at the battle of al-Dimas.
- The Venetian fleet defeats the Egyptian fleet off Ascalon.
- The Pactum Warmundi is established between the Republic of Venice and the Kingdom of Jerusalem.
- Emperor Sutoku succeeds Emperor Toba on the throne of Japan.
- Battle of Yibneh, a Crusader force led by Eustace Grenier crushed a Fatimid army at Yibna.
- First mention of the consuls of Bologna indicating that the city of has become an independent commune.
- Siege of Deventer, conflict between Henry V, Holy Roman Emperor and Lotharius of Supplinburg, duke of Saxony.
- In accordance with the decision of the First Council of the Lateran, the archbishop of Compostela, Diego Gelmirez, declares the Crusade in Iberia against the Andalusians.
By topic 
- The First Council of the Lateran confirms the Concordat of Worms and demands that priests remain celibate.
- St Bartholomew's Hospital (Barts) is founded in London.
- Furness Abbey founded in England, once the second wealthiest and most powerful monastery in the country.
- August 29 – King Eystein I of Norway (b. c. 1088)
- Wanyan Aguda, chieftain of the Jurchen Wanyan tribe (b. 1068)
- Saint Peter of Pappacarbone
- Gilbert Meynier (2010) L'Algérie cœur du Maghreb classique. De l'ouverture islamo-arabe au repli (658-1518). Paris: La Découverte; pp.56.
- Johns, Jeremy (2002). Arabic administration in Norman Sicily: the royal dīwān. Cambridge: Cambridge University Press. p. 85. ISBN 0-521-81692-0.
- Fletcher, R. A. (1987). "Reconquest and Crusade in Spain c. 1050-1150". Transactions of the Royal Historical Society. 5 37: 31–47 . JSTOR 3679149.