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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 2 – The brand new Mandalay Bay hotel and casino opens in Las Vegas.
- 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 jet 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 Serbian 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 Kosovo 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 Serbian 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 25 – The term of Tuanku Jaafar ibni Almarhum Tuanku Abdul Rahman as the 10th Yang di-Pertuan Agong of Malaysia ends.
- 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: the Federal Republic of Yugoslavia and NATO sign a peace treaty.
- 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 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 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 Pakistan 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 Kosovo 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 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 31
- December 3 – After rowing for 81 days and 2,962 nautical miles (5486 km), Tori Murden became the first woman to cross the Atlantic Ocean by rowboat alone, when she reached Guadeloupe from the Canary Islands.
- 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
- April 1 – Jairus Aquino, Filipino actor
- April 2 – Sophie Reynolds, American actress
- April 5
- April 6 – Kwesi Boakye, American actor and voice actor
- April 8
- April 9 – Isaac Hempstead Wright, British actor
- April 15 – Denis Shapovalov, Canadian tennis player
- April 16 – Wendell Carter, American basketball player
- April 18 – Michael Andrew, American swimmer
- April 24 – Jonathan Leko, English footballer
- April 27 – Joel Asoro, Swedish footballer
- April 30 – Jorden van Foreest, Dutch chess grandmaster
- August 2 – Emma Bale, Belgian singer
- August 3 – Brahim Díaz, Spanish footballer
- August 4 – Kelly Gould, American actress
- August 7 – Sydney McLaughlin, American hurdler and sprinter
- August 9
- August 11 – Kevin Knox, American basketball player
- August 12 – Matthijs de Ligt, Dutch footballer
- August 16 – Karen Chen, American figure skater
- August 19 – Ethan Cutkosky, American actor
- August 21 – Maxim Knight, American actor
- August 22
- August 26 – Leonie Kullmann, German swimmer
- August 27 – Mitchell van Bergen, Dutch footballer
- August 28 – Prince Nikolai of Denmark
- August 31 – Miomir Kecmanović, Serbian tennis player
- March 1 – Ann Corio, American dancer and actress (b. 1914)
- March 2 – Dusty Springfield, English pop singer (b. 1939)
- March 3 – Gerhard Herzberg, German-born chemist (b. 1904)
- March 4
- March 5
- March 6
- March 7
- March 8
- March 12 – Yehudi Menuhin, American violinist (b. 1916)
- March 13
- March 17 – Ernest Gold, Austrian-born composer (b. 1921)
- March 19 – Tofilau Eti Alesana, Samoan politician, 6th Prime Minister of Samoa (b. 1924)
- March 21 – Ernie Wise, English comedian (b. 1925)
- March 22 – David Strickland, American actor (b. 1969)
- March 26 – David Holliday, American actor (b. 1937)
- March 29 – Joe Williams, American singer (b. 1918)
- March 31 – Yuri Knorozov, Russian linguist and epigrapher (b. 1922)
- July 1
- July 2 – Mario Puzo, American author (b. 1920)
- July 3 – Mark Sandman, American rock musician and artist (b. 1952)
- July 4 – Jack Watson, English actor (b. 1915)
- July 6
- July 7 – Julie Campbell Tatham, American writer (b. 1908)
- July 8
- July 11 – Helen Forrest, American jazz singer (b. 1917)
- July 12 – Bill Owen, English actor (b. 1914)
- July 16
- July 19 – Jerold Wells, English actor (b. 1908)
- July 20 – Sandra Gould, American actress (b. 1916)
- July 22 – Gar Samuelson, American drummer (b. 1958)
- July 23
- July 25 – Raul Manglapus, Filipino politician (b. 1919)
- July 27 – Phaedon Gizikis, Greek general, 5th President of Greece (b. 1917)
- July 28 – Trygve Haavelmo, Norwegian economist (b. 1911)
- July 29
- August 1 – Nirad C. Chaudhuri, Bengali writer (b. 1897)
- August 2 – Willie Morris, American writer (b. 1934)
- August 3 – Leroy Vinnegar, American musician (b. 1928)
- August 4 – Victor Mature, American actor (b. 1913)
- August 10
- August 13 – Jaime Garzón, Colombian journalist and comedian (b. 1960)
- August 14
- August 17 – Reiner Klimke, German equestrian (b. 1936)
- August 22 – Hide Hyodo Shimizu, Japanese-Canadian educator and activist (b. 1908)
- August 22 – Aleksandr Demyanenko, Russian film and theater actor (b. 1937)
- August 23
- August 24 – Mary Jane Croft, American radio and television actress (b. 1916)
- August 25 – Rob Fisher, British keyboardist and songwriter (b. 1956)
- September 5 – Allen Funt, American television personality (b. 1914)
- September 6 – Lagumot Harris, 3rd President of Nauru (b. 1938)
- September 7 – Jim Keith, American author (b. 1949)
- September 9
- September 10 – Alfredo Kraus, Spanish tenor (b. 1927)
- September 11 – Gonzalo Rodríguez, Uruguayan racing driver (b. 1972)
- September 12 – Allen Stack, American swimmer (b. 1928)
- September 14 – Charles Crichton, English film director (b. 1910)
- September 17 – Frankie Vaughan, British singer (b. 1928)
- September 20 – Raisa Gorbacheva, Soviet first lady (b. 1932)
- September 22 – George C. Scott, American actor (b. 1927)
- September 23 – Ivan Goff, Australian screenwriter (b. 1910)
- September 24 – Ester Boserup, Danish economist (b. 1910)
- September 25 – Marion Zimmer Bradley, American writer (b. 1930)
- October 1 – Lena Zavaroni, Scottish entertainer (b. 1963)
- October 3 – Akio Morita, Japanese businessman (b. 1921)
- October 4
- October 6
- October 7 – Helen Vinson, American actress (b. 1907)
- October 8 – John McLendon, American basketball coach (b. 1915)
- October 9
- October 11 – Rafi Daham al-Tikriti, Iraqi intelligence director (b. 1937)
- October 12 – Wilt Chamberlain, American basketball player (b. 1936)
- October 14 – Julius Nyerere, 1st President of Tanzania (b. 1922)
- October 18 – Paddi Edwards, English-born American actress (b. 1931)
- October 19
- October 20 – Jack Lynch, Taoiseach of Ireland (b. 1917)
- October 21
- October 23 – András Hegedüs, Hungarian politician, 45th Prime Minister of Hungary (b. 1922)
- October 24 – John Chafee, American politician (b. 1922)
- October 25 – Payne Stewart, American golfer (b. 1957)
- October 26
- October 27
- October 31 – Greg Moore, Canadian race car driver (b. 1975)
- November 1
- November 2 – Demetrio B. Lakas, 27th President of Panama (b. 1925)
- November 3 – Ian Bannen, Scottish actor (b. 1928)
- November 8
- November 9 – Mabel King, American actress and singer (b. 1932)
- November 11
- November 12 – Mohammad Mohammadullah, 3rd President of Bangladesh (b. 1921)
- November 15 – Gene Levitt, American television writer, producer, and director (b. 1920)
- November 16 – Daniel Nathans, American microbiologist (b. 1928)
- November 18
- November 20 – Amintore Fanfani, Italian politician, 32nd Prime Minister of Italy (b. 1908)
- November 21
- November 24 – Hilary Minster, English actor (b. 1944)
- November 27 – Jim Wiggins, English actor (b. 1922)
- November 29