January 25, 2011 – Egyptian Revolution of 2011 begins in Egypt, with a series of street demonstrations, marches, rallies, acts of civil disobedience, riots, labour strikes, and violent clashes in Cairo, Alexandria, and throughout other cities in Egypt.

February 3, 2011 – All available blocks of IPv4 internet addresses are officially distributed to regional authorities.

February 11, 2011 – Egyptian Revolution culminates in the resignation of Hosni Mubarak and the transfer of power to the Supreme Military Council after 18 days of protests.

February 22, 2011 – An earthquake measuring 6.3 in magnitude strikes Christchurch, New Zealand, killing 181 people.

April 27, 2011 – The deadliest day of the 2011 Super outbreak of tornadoes, the largest tornado outbreak, in United States history.

July 8, 2011 – Space Shuttle Atlantis is launched in the final mission of the U.S. Space Shuttle program.

July 22, 2011 – Norway is the victim of twin terror attacks, the first being a bomb blast which targeted government buildings in central Oslo, the second being a massacre at a youth camp on the island of Utøya.

September 20, 2011 – The United States ends its “Don't Ask, Don't Tell” policy, allowing gay men and women to serve openly for the first time.

October 20, 2011 – The former leader of Libya, Muammar Gaddafi, and his son Moatassem Gaddafi are killed shortly after the battle of Sirte (2011) while in the custody of NTC fighters.

January 8, 2011 – Prince Vincent and Princess Josephine of Denmark, twin children of Frederik, Crown Prince of Denmark