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Year 1915 (MCMXV) was a common year starting on Friday (link will display the full calendar) of the Gregorian calendar and a common year starting on Thursday of the 13-day-slower Julian calendar.

Events[link]

January 1: HMS Formidable

Below, the events of World War I have the "WWI" prefix.

January[link]

• January – While working as a cook at New York's Sloan Hospital under an assumed name, Typhoid Mary infects 25 people, and is placed in quarantine for life.
• January 1
  • WWI: The battleship HMS Formidable is sunk off Lyme Regis, Dorset, England, by a German U-Boat.
  • The Battle of Broken Hill, a train ambush near Broken Hill, New South Wales, in Australia.
  • Harry Houdini does one of his straitjacket escape performances.^[1][2]
• January 12
  • The United States House of Representatives rejects a proposal to give women the right to vote.
• January 13 – An earthquake (6.8 in Richter scale) in Avezzano, Italy, kills more than 29,000.
• January 18 – Twenty-One Demands from Japan to China are made.
• January 19
  • Georges Claude patents the neon discharge tube for use in advertising.
  • German zeppelins bomb the cities of Great Yarmouth and King's Lynn in the United Kingdom for the first time, killing more than 20.
• January 21 – Kiwanis International is founded in Detroit, Michigan.
• January 26 – The Rocky Mountain National Park is established by an act of the U.S. Congress.
• January 27 – Military casualties begin arriving at the Hôpital Temporaire d'Arc-en-Barrois, established earlier in the month.
• January 28 – An act of the U.S. Congress designates the United States Coast Guard, begun in 1790, as a military branch.
• January 31 – WWI: Germany uses poison gas against the Russians.

January 28: United States Coast Guard military branch.

February[link]

• February 8 – The controversial film, The Birth of a Nation, directed by D.W. Griffith, premieres in Los Angeles, California.
• February 12 – In Washington, D.C. the first stone of the Lincoln Memorial is put into place.
• February 20 – In San Francisco, CA the Panama-Pacific International Exposition is opened.

March[link]

• March – The 1915 locust plague breaks out in Palestine; it continues until October.
• March 3 – NACA, the predecessor of NASA, is founded.
• March 14
  • WWI: Off the coast of Chile, the Royal Navy force SMS Dresden to scuttle.
  • Britain, France and Russia agree to give Constantinople and the Bosporus to Russia in case of victory (the treaty is later nullified by the Bolshevik Revolution).
• March 18 – WWI: A British attack on the Dardanelles fails.
• March 19 – Pluto is photographed for the first time but is not then classified as a planet.
• March 25 – The U.S. submarine F-4 sinks off Hawaii; 21 are killed.
• March 26 – The Vancouver Millionaires Win the Stanley Cup over the Ottawa Senators three games to zero.
• March 28 – The first Roman Catholic Liturgy is celebrated by Archbishop John Ireland at the newly consecrated Cathedral of Saint Paul in Saint Paul, Minnesota.

March 14: (WWI) Royal Navy forced the German light cruiser SMS Dresden to scuttle.

April[link]

• April 22 – WWI: Start of Second Battle of Ypres. First use of poison gas on the western Front.
• April 24 – Beginning of the Armenian Genocide.
• April 25 – WWI: Start of the Gallipoli Campaign (lasting until January 1916): Landing at Anzac Cove by Australian and New Zealand Army Corps and landing at Cape Helles by British and French troops to begin the Allied invasion of the Gallipoli peninsula in the Ottoman Empire.

May 7: (WWI) German U-boat sinks RMS Lusitania.

May[link]

• May 3 – John McCrae writes In Flanders Fields.
• May 5 – WWI: The Turks begin shelling Anzac Cove from a new position behind their lines.
• May 6 – Babe Ruth hits his first career home run off of Jack Warhop.
• May 7 – WWI: The RMS Lusitania is sunk by a German U-boat, killing 1,198.
• May 9 – WWI – Second Battle of Artois: German and French forces fight to a standstill.
• May 17 – The last purely Liberal government in the United Kingdom ends when Prime Minister Herbert Henry Asquith forms an all party coalition.
• May 22 – The Quintinshill railway disaster in Scotland leaves more than 200 dead.
• May 24 – WWI: Italy joins the Allies after they declare war on Austria-Hungary.
• May 25 – China agrees to Twenty-One Demands.
• May 29 – Teófilo Braga becomes president of Portugal.

June[link]

• June 3 – Mexican Revolution: Troops of Obregon and Villa clash at León: Obregon loses his right arm in grenade attack but Villa is decisively defeated.
• June 9 – U.S. Secretary of State William Jennings Bryan resigns over a disagreement regarding his nation's handling of the RMS Lusitania sinking.
• June 16 – The British Women's Institute is founded.

July[link]