1149 (MCXLIX) was a common year starting on Saturday of the Julian calendar, the 1149th year of the Common Era (CE) and Anno Domini (AD) designations, the 149th year of the 2nd millennium, the 49th year of the 12th century, and the 10th and last year of the 1140s decade. As of the start of 1149, the Gregorian calendar was 7 days ahead of the Julian calendar, which was the dominant calendar of the time.

• Castle of Carimate destroyed.
• Nur ad-Din defeats the Principality of Antioch at the Battle of Inab.