Year 929 (CMXXIX) was a common year starting on Thursday (link will display the full calendar) of the Julian calendar.

• January 16 – Emir Abd al-Rahman III of Córdoba, Spain, proclaims himself caliph and creates the Caliphate of Córdoba. He breaks his allegiance to, and ties with, the Fatimid and Abbasid caliphs.^[1]
• February 3 – Guy, Margrave of Tuscany, second husband (third lover) of the Roman noblewoman Marozia, dies. He is succeeded by his brother Lambert as margrave of Tuscany.
• Early 929 – Siege of Gana: German king Henry the Fowler besieges Gana with an East Frankish army and conquers the stronghold. He establishes the fort of Meissen nearby.
• Early 929 – Henry the Fowler invades Bohemia from the north and marches on Prague. Duke Arnulf I of Bavaria invades Bohemia from the south. The Bohemians capitulate.
• Summer – The Slavic-Arab leader Sabir defeats a small Byzantine fleet and seizes Termoli (in Molise, on the Adriatic coast). He returns to Africa laden with booty and slaves.
• September 4 – Battle of Lenzen: Slavic forces (the Redarii and the Obotrites) are defeated by a Saxon army near the fortified stronghold of Lenzen (modern Germany).
• October 7 – Charles the Simple, former king of West Francia, dies in prison at Péronne, leaving Rudolph with no opposition except that of Herbert II, Count of Vermandois.

• Mpu Sindok, ruler of the Mataram Kingdom, moves his court from Central to East Java (modern Indonesia), probably after the eruption of Mount Merapi and/or invasion from Srivijaya.^[2]

• Pope Leo VI dies at Rome after a 7-month reign. He is succeeded (probably handpicked–by Marozia from the Tusculani family) by Stephen VII as the 124th pope of the Catholic Church.

• September 29 – Qian Chu, king of Wuyue (d. 988)
• al-Ta'i', Abbasid caliph of Baghdad (d. 1003)
• Fujiwara no Kaneie, Japanese statesman (d. 990)
• Guo Zhongshu, Chinese painter (approximate date)
• Saigū no Nyōgo (Princess Kishi), Japanese waka poet (d. 985)
• William, archbishop of Mainz (d. 968)

• January 28 – Gao Jixing, founder of Chinese Jingnan (b. 858)
• February 3 – Guy ("the Philosopher"), margrave of Tuscany (Italy)
• February 12 – Leo VI, pope of the Catholic Church
• March 26 – Wang Du, Chinese warlord and governor (jiedushi)
• April 9 – Cui Xie, Chinese official and chancellor
• June 7 – Ælthryth, English princess and countess of Flanders (b. 877)
• Before August 16 – Sancho Ordóñez, king of Galicia (Spain)
• October 7 – Charles the Simple, Frankish king (b. 879)
• Abu Ali al-Husayn ibn Ahmad al-Madhara'i, Abbasid fiscal director
• Abu'l-Musafir al-Fath, Sajid emir of Azerbaijan (Iran)
• Al-Batani, Muslim astronomer and mathematician
• Ashot II, king of Armenia (approximate date)
• Gao Yu, Chinese chief strategist
• Indra III, ruler of Rashtrakuta (India)
• Lothar I, Frankish nobleman (b. 902)
• Lothar II, Frankish nobleman (b. 874)
• Padla II, prince of Kakheti (Georgia)
• Thumal the Qahraman, Abbasid female judge
• Zhao Jingyi, Chinese general and governor