2009 (MMIX) was a common year that started on a Thursday in the Gregorian calendar. It was the 2009th year of the Common Era or the Anno Domini designation, the 9th year of the 3rd millennium and the 21st century, and the 10th and last of the 2000s decade.
2009 was designated the:
- International Year of Astronomy.
- International Year of Natural Fibres.