2015 (MMXV) in the Gregorian calendar was a year without a shooting day that began on a Thursday.
Lithuania introduced the euro as its official currency.
The Norwegian Post and Telecommunications Authority changed its name to the National Communications Authority.
In Sweden, the Police Authority was established as a unified police force after the merger of the National Police Board, 21 county police authorities and the Norwegian Forensic Science Laboratory.
Norway introduces universal conscription for both sexes, and becomes the first NATO country with gender-neutral conscription
Terrorist attack in Paris: The satirical magazine Charlie Hebdo's editorial office in Paris was subjected to an assassination attempt in which twelve were killed.
A car bomb exploded in Yemen's capital, Sanaa. At least 38 people were killed and more than 60 were injured.
Extreme weather Nina hit Western Norway.
A suicide bomber attacked a cafe in Tripoli, Lebanon. 7 people were killed and 30 injured.
January 11 - In Mozambique, 3 days of national mourning were declared because 69 people died after drinking contaminated homemade beer.
January 23 - Salman of Saudi Arabia takes over as King of Saudi Arabia after his brother Abdullah of Saudi Arabia dies.
February 14 - Three people were killed in a terrorist attack in Copenhagen. A debate meeting was first attacked, where a listener was killed. Two people were then killed at the Copenhagen synagogue.
5. – 8. March - IS destroys the ancient cities of Nimrud, Hatra and Dur-Sharrukin.
March 6 - NASA's spacecraft Dawn arrives at the dwarf planet Ceres.
March 17 - Elections in Israel 2015, elections to the Israeli National Assembly, the Knesset
March 20 - Total solar eclipse over i.a. The Faroe Islands and Svalbard. Partial solar eclipse over i.a. South Africa, South India and Antarctica.
March 24 - Germanwings Flight 9525 crashes in the French Alps with 150 people on board.
A magnitude 7.8 earthquake shook Nepal. At least 7,000 people died.
The quake triggered an avalanche on Mount Everest that killed at least 19 people - the deadliest day in the mountain's history.
April 30 - The MESSENGER spacecraft crashes (as planned) towards Mercury after orbiting the planet since 2011.
May 1 - October 31 - Expo 2015 was held in Milan, Italy.
May 7 - The Conservatives win a clear majority in the UK general election in 2015. The SNP won 56 of Scotland's 59 districts.
May 12 - A major aftershock hits Nepal.
May 17 - Nine people were killed and 18 injured during a meeting with rival motorcycle gangs in Waco, Texas. 177 people were arrested.
May 20 - The MERS-CoV virus is first detected in South Korea.
May 23 - In a referendum in Ireland, 62% voted to introduce same-sex marriage.
June 1 - The ship Dongfang zhi xing sank in the Chang Jiang River with 465 people on board. Only 14 survived.
June 2 - FIFA President Sepp Blatter announced that he would convene an extraordinary general meeting to withdraw.
June 17 - Nine people are shot and killed in a church in the city of Charleston in South Carolina, USA. The motive for the killings is white supremacy.
June 26 - Homosexual marriage is legal in all US states.
June 30 - Medan plane crash 2015: A Lockheed C-130 Hercules crashes into a residential area shortly after departing from Medan, Indonesia. 139 people died.
July 14 -
The US space probe New Horizons passed the dwarf planet Pluto.
The nuclear deal with Iran, concluded between Iran and Russia, China, Britain, France, the United States, Germany and the EU, was presented in Vienna.
July 20 - US and Cuba re-establish diplomatic relations, after more than 50 years.
July 31 - IOC's 127th Congress in Kuala Lumpur chooses Beijing as the host city for the 2022 Winter Olympics.
August 6 -
Andrzej Duda was installed as Poland's sixth president