1104
| Years: 1101 1102 1103 - 1104 - 1105 1106 1107 | |
| Decades: 1070s 1080s 1090s - 1100s - 1110s 1120s 1130s | |
| Centuries: 11th century - 12th century - 13th century | |
- The world's first factory, the Venice Arsenal, is founded in Venice.
- Alfonso I of Aragon becomes King of Aragon and Navarre.
- Historian Guibert of Nogent becomes abbot of Notre Dame de Nogent.
- Baldwin I of Jerusalem captured Acre.
- Baldwin II, count of Edessa, is taken prisoner by the Seljuk Turks at the Battle of Harran; Tancred of Hauteville becomes regent.
- Kilij Arslan I, Sultan of Rüm, starts a war with the Danishmends.
- Bohemund I of Antioch is defeated by the Danishmends at Harran.