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2066 (MMLXVI) will be a common year starting on Friday (dominical letter C) of the Gregorian calendar, the 2066th year of the Common Era (CE) and Anno Domini (AD) designations, the 66th year of the 3rd millennium, the 66th year of the 21st century, and the 7th year of the 2060s decade.
- American comic book Atarian Conquest initially takes place in the Earth year of 2066.
- Half-Life mod USS Darkstar is set in 2066.