February 22 – March 14 – Uncertainty over Libyan oil output causes crude oil prices to rise 20% over a two-week period following the Arab Spring, causing the 2011 energy crisis.
February 22 – A 6.3 magnitude earthquake strikes Christchurch, New Zealand. Over 180 people were killed, many within the CTV Building, including a large number of foreign citizens. A large number of foreign search and rescue workers responded to the event.
March 19 – In light of continuing attacks on Libyan rebels by forces in support of leader Muammar Gaddafi, military intervention authorized under UNSCR 1973 begins as French fighter jets make reconnaissance flights over Libya.
April 15 – The Mexican town of Cherán is taken over by vigilantes in response to abuses from the local drug cartel. The new government is strongly focused on crime reduction and preserving the local environment.
July 31 – In Thailand over 12.8 million people are affected by severe flooding. The World Bank estimates damages at 1,440 billion baht (US$45 billion). Some areas are still six feet under water, and many factory areas remain closed at the end of the year. 815 people are killed, with 58 of the country's 77 provinces affected.