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|Ab urbe condita||1765|
|Balinese saka calendar||933–934|
|English Regnal year||N/A|
|Chinese calendar||辛亥年 (Metal Pig)|
3708 or 3648
— to —
壬子年 (Water Rat)
3709 or 3649
|- Vikram Samvat||1068–1069|
|- Shaka Samvat||933–934|
|- Kali Yuga||4112–4113|
|Japanese calendar||Kankō 9 / Chōwa 1|
|Minguo calendar||900 before ROC|
|Seleucid era||1323/1324 AG|
|Thai solar calendar||1554–1555|
1138 or 757 or −15
— to —
1139 or 758 or −14
|Wikimedia Commons has media related to 1012.|
- April 12 – Oldřich, duke of Bohemia, deposes his brother Jaromír who flees to Poland. Oldřich recognises the suzerainty of King Henry II of Germany. He secures his rule by suppressing the Vršovci insurgents.
- Spring – King Æthelred II (the Unready) resumes the payment of Danegeld (48,000 pounds of silver) in an attempt to buy off the Viking raiders.
- Máel Mórda mac Murchada starts a rebellion against High King Brian Boru in Ireland, which ends in 1014 at the Battle of Clontarf.
- Summer – The climax of the Bedouin anti-Fatimid rebellion in Palestine is reached. Abu'l-Futuh al-Hasan ibn Ja'far is acclaimed as anti-Caliph with the title of al-Rashid bi-llah ("Righteous with God").
- The Tepanec tribe settles on the western region of Lake Texcoco. The lineage starts when the Chichimeca chieftain Acolhua marries Cuetlaxochitzin, daughter of Xolotl, another Chichimeca chieftain.
- April 19 – Ælfheah, archbishop of Canterbury, is murdered by his Danish captors at Greenwich (after refusing to pay a ransom of 3,000 pounds for his release).
- May 12 – Pope Sergius IV dies after a 3-year pontificate at Rome. He is succeeded by Benedict VIII as the 143rd pope of the Catholic Church.
- August 19 – Baldwin V, count of Flanders (d. 1067)
- Benedict IX, pope of the Catholic Church (approximate date)
- Cai Xiang, Chinese calligrapher, official and poet (d. 1067)
- Durandus of Troarn, French theologian (approximate date)
- García Sánchez III, king of Pamplona (approximate date)
- Guo, Chinese empress of the Song Dynasty (d. 1035)
- Maria Dobroniega of Kiev, duchess of Poland (d. 1087)
- Marpa Lotsawa, Tibetan Buddhist teacher (d. 1097)
- Rongzom Mahapandita, Tibetan Buddhist scholar (d. 1088)
- Theobald III of Blois, French nobleman (d. 1089)
- April 1 – Herman III, duke of Swabia
- April 19 – Ælfheah, archbishop of Canterbury
- May 12 – Sergius IV, pope of the Catholic Church (b. 970)
- May 26 – Erluin II, monk and abbot of Gembloux
- June 9
- August 12 – Walthard, archbishop of Magdeburg
- September 12 – Ad-Da'i Yusuf, Zaidi imam and ruler
- October 18 – Coloman of Stockerau, Irish pilgrim
- December 22 – Baha' al-Dawla, Buyid emir of Iraq
- Erluin, archdeacon and bishop of Cambrai
- Gaston II Centule, viscount of Béarn
- Gundemaro Pinióliz, Spanish nobleman
- Guy of Anderlecht (or Guido), Christian saint
- Ibn Faradi, Moorish scholar and historian (b. 962)
- John II Crescentius, consul and patrician of Rome
- John Morosini (the Blessed), Venetian abbot
- Otto, duke of Lower Lorraine (approximate date)
- Qabus, Ziyarid emir of Gorgan and Tabaristan
- Roger I, count of Carcassonne (approximate date)
- Tedald of Canossa, Italian nobleman