1912

1912 (MCMXII) was a leap year starting on Monday in the Gregorian calendar and a leap year starting on Sunday in the Julian calendar.

• January 1 - Establishment of Republic of China.
• January 5 - Prague Party Conference
• January 6 - New Mexico is admitted as the 47th U.S. state.
• January 17 - British polar explorer Robert Falcon Scott and a team of four begin the second expedition to reach the South Pole.
• January 23 - The International Opium Convention is signed at The Hague.
• February 8 - Mexican Revolution - Military rebellion against the rule of Francisco Madero begins in Mexico City. Battles last for 10 days
• February 12 - Republic of China adopts the Gregorian calendar
• February 14 - Arizona is admitted as the 48th U.S. state.
• February 14 - In Groton, Connecticut, the first diesel-powered submarine is commissioned.
• February 18 - Francisco Madero is forced to resign - battle ends. All members of Madero's government are arrested.
• February 19 - Prizes are included in Cracker Jack candy boxes for the first time
• February 22 - Francisco Madero and Pino Suarez are shot, allegedly when they "tried to escape"
• March 1 - Albert Berry makes the first parachute jump from a moving airplane.
• March 1 - Georg Ritter von Trapp, head of the famous Austrian singing family memorialized in the musical The Sound of Music marries Agathe
• March 5 - Italian forces are the first to use airships for a military purpose by using them for reconnaissance west of Tripoli behind Turkish lines.
• March 7 - Roald Amundsen announces discovery of the South Pole
• March 7 - French aviator Henri Seimet makes the first non-stop flight from Paris to London in three hours
• March 12 - The Girl Guides (later renamed the Girl Scouts) are founded.
• March 16 - Lawrence Oates, ill member of Scott's South Pole expedition leaves the tent saying, "I am just going outside and may be some time"
• March 27 - Mayor Yukio Ozaki of Tokyo gives 3,000 cherry blossom trees to be planted in Washington, D.C. to symbolize the friendship between the two countries.
• March 30 - France establishes a protectorate over Morocco.
• April 14-15 - The R.M.S Titanic sank after hitting an iceberg in the middle of the Atlantic Ocean. Over 1500 people died.
• April 20 - Fenway Park opens in Boston, Massachusetts. The Red Sox defeat the New York Highlanders 7-6 in 11 innings in the first game. It is the oldest active ballpark.
• Alexis Carrel, French surgeon, won the 1912 Nobel Prize in Physiology or Medicine

• February 12 - Gerhard Armauer Hansen, Norwegian doctor and scientist (b. 1841)
• May 30 - Wilbur Wright of the Wright brothers, American co-inventor of the airplane.
• April 15 - Over 1500 people die on the R.M.S Titanic
• December 11 - James Otis, American children's writer

• May 29 - Premiere of Nijinsky's ballet The Afternoon of a Faun in Paris