2011 (MMXI) was a common year starting on Saturday (dominical letter B) of the Gregorian calendar, the 2011th year of the Common Era (CE) and Anno Domini (AD) designations, the 11th year of the 3rd millennium, the 11th year of the 21st century, and the 2nd year of the 2010s decade.
2011 was designated as:
- International Year of Forests
- International Year of Chemistry
- International Year for People of African Descent