|Ab urbe condita||1780|
|Balinese saka calendar||948–949|
|English Regnal year||N/A|
|Chinese calendar||丙寅年 (Fire Tiger)|
3723 or 3663
— to —
丁卯年 (Fire Rabbit)
3724 or 3664
|- Vikram Samvat||1083–1084|
|- Shaka Samvat||948–949|
|- Kali Yuga||4127–4128|
|Japanese calendar||Manju 4|
|Minguo calendar||885 before ROC|
|Seleucid era||1338/1339 AG|
|Thai solar calendar||1569–1570|
1153 or 772 or 0
— to —
1154 or 773 or 1
|Wikimedia Commons has media related to 1027.|
- March 26 – Pope John XIX crowns Conrad II (the Elder) and his wife Gisela as Holy Roman Emperor and Empress, respectively, in Old St. Peter's Basilica in Rome.
- May 14 – King Robert II (the Pious) sues for peace with his sons. Henry I is crowned co-king of France at Reims Cathedral, but has little power to rule (until 1031).
- Duke Sergius IV of Naples donates the County of Aversa to a band of Norman mercenaries led by Rainulf Drengot, who support him in the war with Capua.
- August 6 – Robert I (the Magnificent) becomes duke of Normandy after the death of his brother Richard III.
- King Cnut the Great attends the coronation of Conrad II in Rome. This proves his position as sole ruler of the Danish North Sea Empire.
- King Sitric Silkbeard of Dublin and sub-King Flannacán of Brega make a pilgrimage to Rome.
- Ealdred is appointed abbot of Tavistock Abbey (approximate date).
- August 16 – Bagrat IV becomes king of Georgia and succeeds his father, George I, after his death. Queen Dowager Mariam becomes regent for her underage son.
- As recorded in the Song Shi, the Song Dynasty Chinese engineer Yan Su reinvents the 3rd-century south-pointing chariot, a mechanical-driven compass vehicle.
- This is the first year of the first rabjyung (60-year) cycle started in the Tibetan calendar.
- Albert III, count of Namur (House of Namur) (approximate date)
- Al-Mu'tamid ibn Abbad, Abbadid ruler of Seville (d. 1095)
- Ernest (the Brave), margrave of Austria (d. 1075)
- Fayun Faxiu, Chinese Chan Buddhist monk (d. 1090)
- Matilda of Franconia, German princess (d. 1034)
- Shōshi, Japanese empress consort (d. 1105)
- Sviatoslav II, Grand Prince of Kiev (d. 1077)
- January 3 – Fujiwara no Yukinari, Japanese calligrapher (b. 972)
- August 6 – Richard III, duke of Normandy (House of Normandy)
- August 16 – George I, king of Georgia (House of Bagrationi)
- October 16 – Fujiwara no Kenshi, Japanese empress (b. 994)
- Abu'l-Qasim al-Husayn ibn Ali al-Maghribi, Arab statesman (b. 981)
- Aurelia of Regensburg, daughter of Hugh Capet and saint
- Dayang Jingxuan, Chinese Zen Buddhist monk (b. 943)
- Dogra mac Dúnadach, king of Síol Anmchadha (Ireland)
- Gadhra Mór mac Dundach, king of Uí Maine (Ireland)
- Hippolytus, archbishop of Gniezno (approximate date)
- Walter of Speyer, German bishop and poet (b. 967)
- Yazid II, Persian ruler (shah) of Shirvan (Azerbaijan)