2011 (MMXI) will be a common year starting on Saturday in the Gregorian calendar. It is the 2011th year of the Common Era, also known as the Christian Era or the Anno Domini designation; the 11th year of the 3rd millennium and of the 21st century, and the 2nd of the 2010s decade.
The United Nations has designated 2011 the International Year of Forests and International Year of Chemistry.
Predicted and scheduled events
January 1 – The Y1C Problem will occur.
January 1 – Start of the Hungarian presidency of the Council of the European Union.
January 1 – Estonia is set to adopt the euro.
January 1 – Inauguration of Dilma Rousseff as President of Brazil, making her the first woman to hold that office.
January 1 – Civil partnerships will become legal in Ireland
January 1 – ASAIBO INDIA will begin helping out with open source projects India
January 2 – Conjunction between Jupiter and Uranus at 13:41 UTC, with Jupiter 34 minutes of arc to the south; the third conjunction of a triple conjunction.
January 4 – Partial solar eclipse visible over most of Europe, the Arabian peninsula, North Africa, and Western Asia.
January 9 – Southern Sudan will hold a referendum on independence.
19 February – 2 April – 2011 Cricket World Cup will be held in India, Sri Lanka and Bangladesh.
March 18 – NASA's MESSENGER spacecraft is scheduled to arrive in orbit around Mercury.
March 18 – NASA's Pluto probe New Horizons will cross the orbit of Uranus, after a five-year journey. This will be faster than Voyager 2, which took eight years.
April 1 – The Space Shuttle will undertake its final mission before retirement.
April 29 – 2011 Men's World Ice Hockey Championships will start in Slovakia.
April 29 – Wedding of Prince William of Wales and Kate Middleton will take place in Westminster Abbey on St. Catherine's Day.
Pakistan will launch its first space satellite.
The Universal House of Justice will announce the new Five Year Plan.
Jupiter, Venus, Mercury, and Mars all visible within a roughly 6° area of sky.
June 1 – Partial solar eclipse in the Arctic.
June 15 – Total lunar eclipse, mainly visible in Africa, India, and the Middle East.
The Dawn spacecraft is scheduled to arrive at the minor planet 4 Vesta during July. The exact date remains uncertain.
July 1 – Start of the Polish presidency of the European Union.
July 1 – Partial solar eclipse off the coast of Antarctica.
July 6 – The International Olympic Committee will decide the host city of the 2018 Winter Olympics.
July 10 – Neptune completes its first full orbit since its discovery in 1846.
August 15 – The comet 45P/Honda-Mrkos-Pajdušáková will pass within 0.0601 astronomical units (about 5,589,300 miles (8,995,100 km)) of Earth.
August 15–21 – XXVI World Youth Day will be held in Madrid, Spain.
September 9 – October 23 – New Zealand will host the 2011 Rugby World Cup.
November 25 – Partial solar eclipse in Antarctica.
December 10 – Total lunar eclipse, visible mainly in Asia, Australia and Alaska.
December 31 – All United States troops are scheduled to leave Iraq