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1999 (MCMXCIX)was a common year starting on Friday of the Gregorian calendar, the 1999th year of the Common Era (CE) and Anno Domini (AD) designations, the 999th year of the 2nd millennium, the 99th year of the 20th century, and the 10th and last year of the 1990s decade.
1999 was designated as the International Year of Older Persons.
- March 1
- March 3 – Walter LaGrand is executed in the gas chamber in Arizona.
- March 4 – In a military court, United States Marine Corps Captain Richard J. Ashby is acquitted of the charge of reckless flying which resulted in the deaths of 20 skiers in the Italian Alps, when his low-flying EA-6B Prowler hit a gondola cable.
- March 12 – Former Warsaw Pact members Hungary, Poland, and the Czech Republic join NATO.
- March 15 – In Brussels, Belgium, the Santer Commission resigns over allegations of corruption.
- March 21
- March 23 – Gunmen assassinate Paraguay's Vice President Luis María Argaña.
- March 24
- March 25 – Enron energy traders allegedly route 2,900 megawatts of electricity destined for California to the town of Silver Peak, Nevada, population 200.
- March 26 – The Melissa worm attacks the Internet.
- March 27 – Kosovo War: A U.S. F-117 Nighthawk is shot down by Yugoslav forces.
- March 29 – For the first time, the Dow Jones Industrial Average closes above the 10,000 mark, at 10,006.78.
- April 1 – Nunavut, an Inuit homeland, is created from the eastern portion of the Northwest Territories to become Canada's third territory.
- April 5
- April 7 – Kosovo War: Kosovo's main border crossings are closed by Yugoslav forces to prevent Kosovar Albanians from leaving.
- April 8 – Bill Gates's personal fortune makes him the wealthiest individual in the world due to the increased value of Microsoft stock.
- April 9 – Ibrahim Baré Maïnassara, president of Niger, is assassinated.
- April 14 – Kosovo War: NATO warplanes repeatedly bomb ethnic Albanian refugee convoys for 2 hours over a 12-mile stretch of road, after mistaking them for Yugoslav military trucks, between Đakovica and Dečani in western Kosovo, killing at least 73 refugees.
- April 17 – A nail bomb, the first of three planted by David Copeland over a fortnight, explodes in the middle of a busy market in Brixton, South London.
- April 20 – Columbine High School massacre: Two Littleton, Colorado, teenagers, Eric Harris and Dylan Klebold, open fire on their teachers and classmates, killing 12 students and 1 teacher, and then themselves.
- April 26
- April 30
- June 1 – Napster, a music downloading service, debuts.
- June 2 – The King of Bhutan allows television transmissions to commence in the Kingdom for the first time, coinciding with the King's Silver Jubilee.
- June 5 – The Islamic Salvation Army, the armed wing of the Islamic Salvation Front, agrees in principle to disband in Algeria.
- June 8 – The government of Colombia announces it will include the estimated value of the country's illegal drug crops, exceeding half a billion US dollars, in its gross national product.
- June 9 – Kosovo War: Yugoslavia and NATO sign a peace treaty to end their hostilities.
- June 10 – Kosovo War: NATO suspends its air strikes after Slobodan Milošević agrees to withdraw Yugoslav forces from Kosovo.
- June 12
- June 14 – Thabo Mbeki is elected president of South Africa.
- June 16 – Thabo Mbeki is inaugurated as the second president of South Africa, marking the first peaceful transfer of executive power in the country's post-democratization history.
- June 18 – The J18 international anti-globalization protests are organized in dozens of cities around the world, some of which led to riots.
- June 19 – Turin, Italy, is awarded the 2006 Winter Olympics.
- June 24 – Kosovo War: NATO marines shoot three gunmen in Kosovo, Yugoslavia after being attacked by the latter, killing one of them and injuring the other two.
- June 25 – Bosnia and Herzegovina gets a new national anthem.
- June 30 – Twenty-three people die in a fire at the Sealand Youth Training Center in South Korea.
- July 1
- July 7 – In Rome, Hicham El Guerrouj runs the fastest mile ever recorded, at 3:43.13.
- July 10 – American soccer player Brandi Chastain scores the game winning penalty kick against China in the final of the FIFA Women's World Cup.
- July 11 – India recaptures Kargil, forcing the Pakistani army to retreat. India announces victory, ending the 2-month conflict.
- July 16 – Off the coast of Martha's Vineyard, a plane crashes piloted by John F. Kennedy Jr., killing him, his wife Carolyn Bessette-Kennedy, and her sister Lauren Bessette.
- July 20
- July 23
- July 23 – Fourteen Kosovar Serb villagers are killed by ethnic Albanian gunmen in the village of Staro Gračko.
- July 27 – Twenty-one people die in a canyoning disaster at the Saxetenbach Gorge near Interlaken, Switzerland.
- July 31 – NASA intentionally crashes the Lunar Prospector spacecraft into the Moon, thus ending its mission to detect frozen water on the lunar surface.
- September 7 – The 6.0 Mw Athens earthquake affected the area with a maximum Mercalli intensity of IX (Violent), killing 143, injuring 800–1,600, and leaving 50,000 homeless.
- September 8 – The first of a series of Russian apartment bombings occurs. Subsequent bombings occur on September 13 and 16, while a bombing on September 22 fails.
- September 9 – The Sega Company introduces in American market the new game console with the name Dreamcast.
- September 12 – Under international pressure to allow an international peacekeeping force, Indonesian president BJ Habibie announces that he will do so.
- September 14 – Kiribati, Nauru and Tonga join the United Nations.
- September 21 – The 921 earthquake, also known as the Jiji earthquake (magnitude 7.6 on the Richter scale), kills about 2,400 people in Taiwan.
- October – NASA loses one of its probes, the Mars Climate Orbiter.
- October 1 – Shanghai Pudong International Airport opens in China, taking over all international flights from Hongqiao.
- October 5 – Thirty-one people die in the Ladbroke Grove rail crash, west of London, England.
- October 12 – Pakistani Prime Minister Nawaz Sharif attempts to dismiss Army Chief General Pervez Musharraf, who is out of the country. The generals lead a coup d'état, ousting Sharif's administration, and Musharraf takes control of the government.
- October 13 – The United States Senate rejects ratification of the Comprehensive Test Ban Treaty (CTBT).
- October 27 – Gunmen open fire in the Armenian Parliament, killing Prime Minister Vazgen Sargsyan, Parliament Chairman Karen Demirchyan, and six other members.
- October 29 – A super cyclonic storm impacts Orissa, India, killing approximately 10,000 people.
- October 30 –
1999 Inchon bar fire : A pub catches fire in Inchon, South Korea, killing 56 people.
- October 31
- December 3
- December 5 – Bolivian municipal elections, the first election contested by Evo Morales' Movement for Socialism.
- December 18 – NASA launched the Terra platform into orbit, carrying 5 Earth Observation instruments, including ASTER, CERES, MISR, MODIS and MOPITT.
- December 20 – The sovereignty of Macau is transferred from the Portuguese Republic to the People's Republic of China after 442 years of Portuguese settlement.
- December 26 – Cyclones Lothar and Martin killed 140 people as they crossed France, southern Germany, and Switzerland.
- December 27 – Storm Martin caused damage throughout France, Spain, Switzerland and Italy, including an emergency due to flooding at the Blayais Nuclear Power Plant.
- December 31