January 1913
January 3 – First Balkan War: Greece completes its capture of the eastern Aegean island of Chios, as the last Ottoman forces on the island surrender.
January 13 – Edward Carson founds the (first) Ulster Volunteer Force, by unifying several existing loyalist militias to resist home rule for Ireland.
January 18 – First Balkan War: Battle of Lemnos – Greek admiral Pavlos Kountouriotis forces the Turkish fleet to retreat to its base within the Dardanelles, from which it will not venture for the rest of the war.
January 23 – 1913 Ottoman coup d'état: Enver Pasha comes to power.
February 1913
February 1 – New York City's Grand Central Terminal, having been rebuilt, reopens as the world's largest railroad station.
February 3 – The Sixteenth Amendment to the United States Constitution is ratified, authorizing the Federal government to impose and collect income taxes on all sources of income, not just some.
February 9 – Mexican Revolution: "La Decena Trágica", the rebellion of some military chiefs against the President Francisco I. Madero, begins.
February 13 – Thubten Gyatso, the 13th Dalai Lama, declares the independence of Tibet from Qing dynasty China.
February 18 – Mexican Revolution: President Francisco I. Madero and Vice President José María Pino Suárez are forced to resign. Pedro Lascuráin serves as president for less than an hour, before General Victoriano Huerta, leader of the coup, takes office.
February 22 – Mexican Revolution: Francisco I. Madero and José María Pino Suárez are assassinated.
February 23 – Joseph Stalin is arrested by the Russian secret police, the Okhrana, in Petrograd, and exiled to Siberia.
March 1913
March
The House of Romanov celebrates the 300th anniversary of its succession to the throne, amidst an outpouring of monarchist sentiment in Russia.
Following the assassination of his rival Song Jiaoren, Yuan Shikai uses military force to dissolve China's parliament, and rules as a dictator.
c. March 1 – British steamship Calvados disappears in the Sea of Marmara, with 200 on board.