|923 by topic|
|Ab urbe condita||1676|
|Balinese saka calendar||844–845|
|Chinese calendar||壬午年 (Water Horse)|
3619 or 3559
— to —
癸未年 (Water Goat)
3620 or 3560
|- Vikram Samvat||979–980|
|- Shaka Samvat||844–845|
|- Kali Yuga||4023–4024|
|Japanese calendar||Engi 23 / Enchō 1|
|Minguo calendar||989 before ROC|
|Seleucid era||1234/1235 AG|
|Thai solar calendar||1465–1466|
1049 or 668 or −104
— to —
1050 or 669 or −103
Year 923 (CMXXIII) was a common year starting on Wednesday (link will display the full calendar) of the Julian calendar.
- June 15 – Battle of Soissons: King Robert I is killed; the Frankish army, led by Charles the Simple, is defeated and routed near Soissons. Charles is captured and imprisoned at Péronne. The nobles elect Robert's son-in-law Rudolph, duke of Burgundy, as king of the West Frankish Kingdom (until 936).
- July 29 – Battle of Fiorenzuola: Lombard forces led by King Rudolph II and Adalbert I, margrave of Ivrea, defeat the deposed Emperor Berengar I at Firenzuola (Tuscany). A pact is reached between Rudolph and Berengar, who abdicates the imperial throne and cedes sovereignty over the rest of Italy.
- May 13 – The Later Liang, one of the Five Dynasties in China, falls to Later Tang (founded by Li Cunxu). Li proclaims himself emperor and moves his residence back to the old Tang capital of Luoyang.
- August 11 – The Qarmatians of Bahrayn capture and pillage the city of Basra.
- September 7 – Suzaku, emperor of Japan (d. 952)
- Abū Hayyān al-Tawhīdī, Muslim intellectual (d. 1023)
- Al-Shaykh al-Saduq, Muslim scholar (approximate date)
- Eadred (or Edred), king of England (d. 955)
- Fujiwara no Nakafumi, Japanese waka poet (d. 992)
- Jeongjong, king of Goryeo (Korea) (d. 949)
- Liu Honggao, Chinese chancellor (d. 943)
- June 15 – Robert I, king of the West Frankish Kingdom (b. 860)
- August 2 – Plegmund, archbishop of Canterbury (or 914)
- August 27 – Ageltrude, queen of Italy and Holy Roman Empress
- October 8 – Pilgrim I, archbishop of Salzburg
- November 20
- Jing Xiang, Chinese strategist
- Li Zhen, official of Later Liang
- Abu Bakr al-Khallal, Muslim scholar and jurist (b. 848)
- Adarnase IV, prince of Iberia/Kartli (Georgia)
- Badr al-Hammami (the Elder), Abbasid general
- Gurgen I, prince of Tao-Klarjeti (Georgia)
- Harshavarman I, king of Angkor (Cambodia)
- Ibn Khuzaymah, Muslim hadith and scholar (b. 837)
- Ma Chuo, general and official of Wuyue (or 922)
- Muhammad ibn Jarir al-Tabari, Persian scholar (b. 839)
- Reccared, Galician clergyman (b. 885)
- Ricwin (or Ricuin), Frankish nobleman
- Walter (or Vaulter), archbishop of Sens
- Wang Yanzhang, general of Later Liang (b. 863)
- Zhao Yan, military prefect and official of Later Liang
- Zhu Youzhen, emperor of Later Liang (b. 888)
- ^ Timothy Reuter (1999). The New Cambridge Medieval History: Volume III, p. 379. ISBN 978-0-521-36447-8.
- ^ Timothy Reuter (1999). The New Cambridge Medieval History: Volume III, p. 349. ISBN 978-0-521-36447-8.
- ^ Halm, Heinz (1991). Das Reich des Mahdi: Der Aufstieg der Fatimiden [The Empire of the Mahdi: The Rise of the Fatimids] (in German). Munich: C. H. Beck. p. 226. ISBN 978-3-406-35497-7.