1166 (MCLXVI) was a common year starting on Saturday of the Julian calendar, the 1166th year of the Common Era (CE) and Anno Domini (AD) designations, the 166th year of the 2nd millennium, the 66th year of the 12th century, and the 7th year of the 1160s decade. As of the start of 1166, the Gregorian calendar was 7 days ahead of the Julian calendar, which was the dominant calendar of the time.

• December 24 – John I of England

• Marko III follows Yoannis V as patriarch of Alexandria.
• Henry the Lion builds the first bronze statue north of the Alps.
• Giraldo Sempavor captures Evora.

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