|1030 by topic|
|Birth and death categories|
|Births – Deaths|
|Establishments and disestablishments categories|
|Establishments – Disestablishments|
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- June – Stephen I of Hungary forces the invading armies of the Holy Roman Empire, led by Conrad II, to retreat back to Germany.
- July 29 – Battle of Stiklestad (Norway): Olaf II of Norway loses to his pagan vassals, and is killed in the battle. He is later canonized, and becomes the patron saint of Norway and Rex perpetuum Norvegiae ('the eternal king of Norway').
- The city of Kaunas, Lithuania is founded.
- The first mention is made of Tartu, Estonia, as Yaroslav the Wise of Novgorod and Kiev defeats the Chuds, and founds a fort named Yuryev (modern Tartu).
- The earliest mention is made of Thalwil, Switzerland.
- Henry I of France revolts against his father Robert.
- The Song Dynasty Chinese historian and scholar Ouyang Xiu obtains his jinshi degree at the age of only 22, by passing the highest level examinations in the country (his third attempt), leading him into a distinguished path as a scholar-official.
- Battle of Azaz: Byzantine Emperor Romanus III invades Syria, and is defeated.
- Masud seizes the throne of the Ghaznavid Empire, after the death of his father Mahmud.
- July 21 – Kyansittha, King of Burma (d. 1112)
- July 26 – Stanislaus of Szczepanów (St. Stanislaw), Bishop of Kraków (martyred 1079)
- Baldwin VI, Count of Flanders (d. 1070)
- Vsevolod I of Kiev (d. 1093)
- January 31 – William V, Duke of Aquitaine (b. 969)
- April 30 – Mahmud of Ghazni
- July 19 or 1031 – Adalberon, bishop of Laon
- July 29 – King Olaf II of Norway (b. 995)
- Gormflaith ingen Murchada, Irish queen (b. 960)
- Tvauri, Andres (2012). The Migration Period, Pre-Viking Age, and Viking Age in Estonia. pp. 33, 59, 60. Retrieved 27 December 2016.