| 2008 | March 12 | Death Jorge Guinzburg, Argentine journalist, producer and media host (birth 1949) |
| 2008 | March 12 | Death Lazare Ponticelli, French soldier (birth 1897) |
| 2006 | March 12 | Death Victor Sokolov, Russian dissident journalist and priest (birth 1947) |
| 2005 | March 12 | Tung Chee Hwa, the first Chief Executive of Hong Kong, steps down from his post after his resignation is approved by the Chinese central government. |
| 2005 | March 12 | Death Bill Cameron, Canadian journalist (birth 1943) |
| 2005 | March 12 | Death Stavros Koujioumtzis, Greek songwriter (birth 1932) |
| 2004 | March 12 | A President of South Korea, Roh Moo-hyun, is impeached by its national assembly for the first time in the nation's history. |
| 2003 | March 12 | Zoran Đinđić, Prime Minister of Serbia, is assassinated in Belgrade. |
| 2003 | March 12 | Death Zoran Đinđić, Prime Minister of Serbia (birth 1952) |
| 2003 | March 12 | Death Howard Fast, American author (birth 1914) |
| 2003 | March 12 | Death Andrei Kivilev, Kazakh cyclist (birth 1973) |
| 2003 | March 12 | Death Lynne Thigpen, American actress (birth 1948) |
| 2002 | March 12 | Death Spyros Kyprianou, Cypriot politician (birth 1932) |
| 2002 | March 12 | Death Jean-Paul Riopelle, Quebec painter and sculptor (birth 1923) |
| 2001 | March 12 | Death Morton Downey, Jr., American television talk show host (birth 1933) |
| 2001 | March 12 | Death Robert Ludlum, American author (birth 1927) |
| 1999 | March 12 | Former Warsaw Pact members the Czech Republic, Hungary and Poland join NATO. |
| 1999 | March 12 | Death Yehudi Menuhin, American-born violinist (birth 1916) |
| 1998 | March 12 | Death Judge Dread, English musician (birth 1945) |
| 1998 | March 12 | Death Jozef Kroner, Slovak actor (birth 1924) |
| 1998 | March 12 | Death Beatrice Wood, American artist and ceramist (birth 1893) |
| 1995 | March 12 | Death Juanin Clay, American actress (birth 1949) |
| 1994 | March 12 | The Church of England ordains its first female priests. |
| 1994 | March 12 | Birth Tyler Patrick Jones, American actor |
| 1993 | March 12 | Several bombs explode in Bombay (Mumbai), India, killing about 300 and injuring hundreds more. |
| 1993 | March 12 | North Korea nuclear weapons program: North Korea says that it plans to withdraw from the Nuclear Nonproliferation Treaty and refuses to allow inspectors access to its nuclear sites. |
| 1993 | March 12 | The Blizzard of 1993 - Snow would begin to fall across the eastern portion of the US with tornadoes, thunder snow storms, high winds and record low temperatures. The storm would last another 30 hours before it left the US. |
| 1992 | March 12 | Mauritius becomes a republic while remaining a member of the Commonwealth of Nations. |
| 1991 | March 12 | Death Ragnar Granit, Finnish neuroscientist, Nobel laureate (birth 1900) |
| 1990 | March 12 | Death Wallace Breem, British author (birth 1926) |
| 1989 | March 12 | Death Maurice Evans, English-born actor (birth 1901) |
| 1987 | March 12 | Birth Chris Seitz, American footballer |
| 1987 | March 12 | Death Woody Hayes, American football coach (birth 1913) |
| 1986 | March 12 | Birth Danny Jones, English singer (McFly) |
| 1986 | March 12 | Birth Ben Offereins, Australian athlete |
| 1985 | March 12 | Birth Bradley Wright-Phillips, English footballer |
| 1985 | March 12 | Birth Tosh Townend, American skateboarder |
| 1985 | March 12 | Death Eugene Ormandy, Hungarian conductor (birth 1899) |
| 1984 | March 12 | Birth Jaimie Alexander, American actress |
| 1984 | March 12 | Birth Shreya Ghoshal, Indian singer |
| 1984 | March 12 | Death Arnold Ridley, English playwright and actor (birth 1896) |
| 1983 | March 12 | Birth Atif Aslam, Pakistani singer |
| 1982 | March 12 | Birth Samm Levine, American actor |
| 1982 | March 12 | Birth Zach Miner, American baseball player |
| 1982 | March 12 | Birth Tobias Schweinsteiger, German footballer |
| 1981 | March 12 | Birth Kenta Kobayashi, Japanese wrestler |
| 1980 | March 12 | Birth Douglas Murray, Swedish ice hockey player |
| 1980 | March 12 | Death Arthur Charles Dobson, British racing driver (birth 1914) |
| 1979 | March 12 | Birth Pete Doherty, English musician |
| 1979 | March 12 | Birth Rhys Coiro, American actor |
| 1979 | March 12 | Birth Nidia Guenard, American wrestler |
| 1979 | March 12 | Birth Edwin Villafuerte, Ecuadorian footballer |
| 1978 | March 12 | Birth Masuimi Max, American model |
| 1978 | March 12 | Birth Casey Mears, American auto racer |
| 1978 | March 12 | Birth Claudio Sanchez, American musician (Coheed and Cambria) |
| 1978 | March 12 | Birth Arina Tanemura, Japanese mangaka |
| 1978 | March 12 | Death John Cazale, American actor (birth 1935) |
| 1978 | March 12 | Death Gene Moore, American baseball player (birth 1909) |
| 1977 | March 12 | Birth Ramiro Corrales, American footballer |
| 1976 | March 12 | Birth Zhao Wei, Chinese actress |
| 1975 | March 12 | Birth Kelle Bryan, English singer |
| 1975 | March 12 | Birth Todd Rock, American Polition, Pennsylvania House of Representitives |
| 1975 | March 12 | Birth Herman Li, Cantonese guitarist |
| 1975 | March 12 | Birth Annabel Port, English radio presenter |
| 1974 | March 12 | Birth Steve Price, Australia rugby league player |
| 1974 | March 12 | Death George D. Sax, American entrepreneur (birth 1904) |
| 1973 | March 12 | Death Frankie Frisch, American baseball player (birth 1898) |
| 1972 | March 12 | Birth Hector Luis Bustamante, Colombian actor |
| 1972 | March 12 | Birth James Maritato, American wrestler |
| 1971 | March 12 | The March 12 Memorandum, is sent to the Demirel government of Turkey and the government resigns. |
| 1971 | March 12 | Birth Tony Eveready (Duane Moore), American adult film actor |
| 1971 | March 12 | Birth Isaiah Rider, American basketball player |
| 1970 | March 12 | Birth Dave Eggers, American writer, editor, and publisher |
| 1970 | March 12 | Birth Ray Prewitt, American actor |
| 1970 | March 12 | Birth Roy Khan, Norwegian singer (Kamelot) |
| 1970 | March 12 | Birth John Nemechek, American NASCAR driver (death 1997) |
| 1970 | March 12 | Birth Rex Walters, American basketball player |
| 1969 | March 12 | Birth Graham Coxon, English musician (Blur) |
| 1969 | March 12 | Birth Jake Tapper, American journalist |
| 1968 | March 12 | Mauritius achieves independence. |
| 1968 | March 12 | Birth Aaron Eckhart, American actor |
| 1968 | March 12 | Birth Tammy Duckworth, American politician, military aviator |
| 1967 | March 12 | Birth Julio Dely Valdes, Panamanian footballer |
| 1966 | March 12 | Suharto takes over from Sukarno to become President of Indonesia. |
| 1966 | March 12 | Birth Grant Long, American Basketball Player |
| 1966 | March 12 | Birth John Thompson III, NCAA Basketball Head Coach |
| 1965 | March 12 | Birth Steve Finley, American baseball player |
| 1965 | March 12 | Birth Shawn Gilbert, American baseball player |
| 1965 | March 12 | Birth Steve Levy, American sports journalist |
| 1965 | March 12 | Birth Coleen Nolan, British singer |
| 1965 | March 12 | Birth Liza Umarova, Chechen torch singer |
| 1964 | March 12 | New Hampshire Lottery: New Hampshire becomes the first state to sell lottery tickets in the modern era. |
| 1963 | March 12 | Birth Ian Holloway, English football manager |
| 1963 | March 12 | Birth Joaquim Cruz, Brazilian runner |
| 1962 | March 12 | Birth Darryl Strawberry, American baseball player |
| 1961 | March 12 | Birth Joseph Facal, Quebec politician |
| 1960 | March 12 | Birth Kipp Lennon, American singer |
| 1960 | March 12 | Birth Minoru Niihara, Japanese singer |
| 1960 | March 12 | Birth Maki Nomiya, Japanese singer (Pizzicato Five) |
| 1960 | March 12 | Birth Courtney B. Vance, American actor |
| 1958 | March 12 | Birth Matt Millen, American football player |
| 1957 | March 12 | Birth Patrick Battiston, French footballer |
| 1957 | March 12 | Birth Marlon Jackson, American singer and musician (The Jackson 5) |
| 1956 | March 12 | Birth Steve Harris founder/bassist of Iron Maiden |
| 1956 | March 12 | Birth Dale Murphy, American baseball player |
| 1955 | March 12 | Death Charlie Parker, American jazz saxophonist (birth 1920) |
| 1953 | March 12 | Birth Carl Hiaasen, American journalist and author |
| 1953 | March 12 | Birth Ron Jeremy, American pornographic actor |
| 1953 | March 12 | Birth Madhav Kumar Nepal, Nepalese politician |
| 1952 | March 12 | Birth Naomi Shihab Nye, American poet, songwriter, and novelist |
| 1950 | March 12 | Birth Javier Clemente, Spanish football manager |
| 1950 | March 12 | Birth Jon Provost, American actor |
| 1950 | March 12 | Birth Wheeler Winston Dixon, American filmmaker, critic and author |
| 1949 | March 12 | Birth Rob Cohen, American film director, producer and writer |
| 1949 | March 12 | Birth Moctesuma Esparza, Mexican-American producer and filmmaker |
| 1949 | March 12 | Birth Natalia Kuchinskaya, Soviet gymnast |
| 1948 | March 12 | Birth James Taylor, American musician |
| 1948 | March 12 | Birth Kent Conrad, Junior Senator of North Dakota |
| 1948 | March 12 | Birth Virginia Bottomley, British politician |
| 1947 | March 12 | The Truman Doctrine is proclaimed to help stem the spread of Communism. |
| 1947 | March 12 | Birth Kalervo Palsa, Finnish artist (death 1987) |
| 1947 | March 12 | Birth Mitt Romney, former Governor of Massachusetts, 2008 Presidential Candidate |
| 1947 | March 12 | Death ;Winston Churchill the American;, American novelist (birth 1871) |
| 1946 | March 12 | Birth Liza Minnelli, American singer and actress |
| 1946 | March 12 | Birth Frank Welker, American voice actor |
| 1946 | March 12 | Birth Peter Whalley, British television writer and author |
| 1946 | March 12 | Birth Serge Turgeon, Quebec actor and union leader (death 2004) |
| 1946 | March 12 | Death Ferenc Szálasi, Hungarian politician (executed) (birth 1897) |
| 1945 | March 12 | Birth Sammy ;The Bull; Gravano, American gangster |
| 1945 | March 12 | Death Friedrich Fromm, German Army Officer (birth 1861) |
| 1944 | March 12 | Death Artur Gavazzi, Croatian geographer (birth 1861) |
| 1943 | March 12 | Death Gustav Vigeland, Norwegian sculptor (birth 1869) |
| 1942 | March 12 | Birth Ratko Mladić, Republika Srpska leader |
| 1942 | March 12 | Birth Jimmy Wynn, American baseball player, 1963-1977 |
| 1942 | March 12 | Death Robert Bosch, German industrialist (birth 1861) |
| 1940 | March 12 | Winter War: Finland signs the Moscow Peace Treaty with the Soviet Union, ceding almost all of Finnish Karelia. Finnish troops and the remaining population are immediately evacuated. |
| 1940 | March 12 | Birth Al Jarreau, American singer |
| 1940 | March 12 | Birth M.A. Numminen, Finnish singer and writer |
| 1938 | March 12 | ''Anschluss:'' German troops occupy Austria. |
| 1938 | March 12 | Birth Johnny Rutherford, American automobile racer |
| 1937 | March 12 | Death Jenő Hubay, Hungarian violinist (birth 1858) |
| 1937 | March 12 | Death Charles-Marie Widor, French organist and composer (birth 1844) |
| 1936 | March 12 | Birth Patrick Procktor, English artist (death 2003) |
| 1935 | March 12 | Birth John Doherty, English footballer (death 2007) |
| 1934 | March 12 | Konstantin Päts and General Johan Laidoner stage a coup in Estonia, and ban all political parties. |
| 1933 | March 12 | Great Depression: Franklin D. Roosevelt addresses the nation for the first time as President of the United States. This was also the first of his ;fireside chats;. |
| 1932 | March 12 | Birth Barbara Feldon, American actress and model |
| 1932 | March 12 | Birth Andrew Young, American civil rights activist and politician |
| 1931 | March 12 | Birth Herbert Kelleher, Southwest Airlines co-founder |
| 1931 | March 12 | Birth Billie ;Buckwheat; Thomas, American actor (death 1980) |
| 1930 | March 12 | Mahatma Gandhi leads a 200-mile march, known as the ''Dandi March'', to the sea in defiance of British opposition, to protest the British monopoly on salt. |
| 1930 | March 12 | Birth Vernon Law, American baseball player |
| 1930 | March 12 | Death Alois Jirásek, Czech writer (birth 1851) |
| 1930 | March 12 | Death William George Barker, Canadian fighter ace (birth 1894) |
| 1929 | March 12 | Birth U Win Tin, jailed Burmese journalist |
| 1929 | March 12 | Death Asa Griggs Candler, American businessman (birth 1851) |
| 1928 | March 12 | In California, the St. Francis Dam fails, killing over 600 people. |
| 1928 | March 12 | Birth Edward Albee, American dramatist |
| 1928 | March 12 | Birth Thérèse Lavoie-Roux, Quebec politician and senator |
| 1928 | March 12 | Birth Aldemaro Romero, Venezuelan musician (death 2007) |
| 1926 | March 12 | Birth Raúl Alfonsín, President of Argentina |
| 1925 | March 12 | Birth Louison Bobet, French cyclist (death 1983) |
| 1925 | March 12 | Birth Georges Delerue, French film composer (death 1992) |
| 1925 | March 12 | Birth Leo Esaki, Japanese physicist, Nobel laureate |
| 1925 | March 12 | Birth Harry Harrison, American author |
| 1925 | March 12 | Death Sun Yat-sen, Chinese revolutionary and politician (birth 1866) |
| 1923 | March 12 | Birth Hjalmar Andersen, Norwegian speed skater |
| 1923 | March 12 | Birth Norbert Brainin, Austrian violinist (death 2005) |
| 1923 | March 12 | Birth Wally Schirra, American astronaut (death 2007) |
| 1923 | March 12 | Birth Mae Young, American professional wrestler |
| 1922 | March 12 | Birth Jack Kerouac, American writer (death 1969) |
| 1922 | March 12 | Birth Lane Kirkland, American labor leader (death 1999) |
| 1921 | March 12 | Birth Gianni Agnelli, Italian auto executive (death 2003) |
| 1921 | March 12 | Birth Ülo Jõgi, Estonian freedom fighter (death 2007) |
| 1921 | March 12 | Birth Gordon MacRae, American singer and actor (death 1986) |
| 1918 | March 12 | Moscow becomes the capital of Russia again after Saint-Petersburg held this status for 215 years. |
| 1918 | March 12 | Birth Elaine de Kooning, American artist (death 1989) |
| 1917 | March 12 | Birth Millard Kaufman, American screenwriter (death 2009) |
| 1917 | March 12 | Birth Googie Withers, British actress |
| 1916 | March 12 | Death Marie von Ebner-Eschenbach, Austrian writer (birth 1830) |
| 1914 | March 12 | Birth Julia Lennon, John Lennon's mother (death 1958) |
| 1914 | March 12 | Death George Westinghouse, American entrepreneur and engineer (birth 1846) |
| 1913 | March 12 | Canberra Day: The future capital of Australia is officially named Canberra. (Melbourne remained temporary capital until 1927 while the new capital was still under construction.) |
| 1912 | March 12 | The Girl Guides (later renamed the Girl Scouts of the USA) are founded in the United States. |
| 1912 | March 12 | Birth Irving Layton, Canadian poet (death 2006) |
| 1912 | March 12 | Birth Paul Weston, American pianist, arranger and conductor (death 1996) |
| 1911 | March 12 | Birth Gustavo Díaz Ordaz, President of Mexico (death 1979) |
| 1910 | March 12 | Birth Masayoshi Ohira, Prime Minister of Japan (death 1980) |
| 1909 | March 12 | Death Joe Petrosino, American police lieutenant (birth 1860) |
| 1908 | March 12 | Birth Rita Angus, New Zealand painter (death 1970) |
| 1908 | March 12 | Birth David Saul Marshall Singapore's first Chief Minister(death 1995) |
| 1908 | March 12 | Death Edmondo De Amicis, Italian children's writer (birth 1846) |
| 1907 | March 12 | Birth Arthur Hewlett, British actor (death 1997) |
| 1907 | March 12 | Birth Dorrit Hoffleit, American astronomer (death 2007) |
| 1898 | March 12 | Death Zacharias Topelius, Finnish-Swedish writer (birth 1818) |
| 1895 | March 12 | Birth William C. Lee, U.S. Army general (death 1948) |
| 1894 | March 12 | In Vicksburg, Mississippi, USA, Coca-Cola is sold in bottles for the first time. |
| 1894 | March 12 | Death Illarion Pryanishnikov, Russian painter (birth 1840) |
| 1891 | March 12 | Birth George W. Mason, American industrialist (death 1954) |
| 1890 | March 12 | Birth Vaslav Nijinsky, Polish ballet dancer (death 1950) |
| 1890 | March 12 | Birth William Dudley Pelley, American leader of the Silver Legion (death 1965) |
| 1890 | March 12 | Birth Evert Taube, Swedish author, artist, composer and singer (death 1976) |
| 1889 | March 12 | Birth Þórbergur Þórðarson, Icelandic author (death 1974) |
| 1889 | March 12 | Birth Idris I, King of Libya (death 1983) |
| 1883 | March 12 | Birth Zoltán Meskó, Hungarian Nazi (death 1959) |
| 1881 | March 12 | Andrew Watson makes his Scotland debut as the world's first black international football player and captain. |
| 1881 | March 12 | Birth Mustafa Kemal Atatürk, first President of Turkey (death 1938) |
| 1881 | March 12 | Birth Gunnar Nordström, Finnish physicist (death 1923) |
| 1880 | March 12 | Birth Nikolaos Georgantas, Greek discus thrower (death 1958) |
| 1880 | March 12 | Birth Henry Drysdale Dakin, British-American biochemist, known for the Dakin-West reaction (death 1952) |
| 1872 | March 12 | Death Zeng Guofan, Chinese politician and general (birth 1811) |
| 1868 | March 12 | Henry O'Farrell attempts to assassinate Prince Alfred, Duke of Edinburgh. |
| 1864 | March 12 | Birth W. H. R. Rivers, British psychiatrist (death 1922) |
| 1864 | March 12 | Birth Alice Tegnér, Swedish composer and organist (death 1943) |
| 1863 | March 12 | Birth Gabriele D'Annunzio, Italian writer (death 1938) |
| 1863 | March 12 | Birth Vladimir Vernadsky, Russian mineralogist (death 1945) |
| 1859 | March 12 | Birth Abraham H. Cannon, Mormon apostle (death 1896) |
| 1838 | March 12 | Birth William Henry Perkin, English chemist (death 1907) |
| 1837 | March 12 | Birth Alexandre Guilmant, French organist and composer (death 1911) |
| 1835 | March 12 | Birth Simon Newcomb, American astronomer and mathematician (death 1909) |
| 1832 | March 12 | The Filippo Taglioni ballet ''La Sylphide'' receives its première performance at the Paris Opéra. |
| 1832 | March 12 | Birth Charles Boycott, British land agent and source of the term ''to boycott'' (death 1897) |
| 1832 | March 12 | Death Friedrich Kuhlau, German composer (birth 1786) |
| 1831 | March 12 | Birth Clement Studebaker, American automobile pioneer (death 1901) |
| 1824 | March 12 | Birth Gustav Kirchhoff, German physicist (death 1887) |
| 1821 | March 12 | Birth Sir John Abbott, third Prime Minister of Canada (death 1893) |
| 1806 | March 12 | Birth Jane Pierce, First Lady of the United States (death 1863) |
| 1790 | March 12 | Death Andreas Hadik, Austro-Hungarian general (birth 1710) |
| 1781 | March 12 | Birth Frederica of Baden, Queen of Sweden (death 1826) |
| 1757 | March 12 | Death Giuseppe Galli-Bibiena, Italian architect/painter (birth 1696) |
| 1718 | March 12 | Birth Joseph Damer, English politician (death 1798) |
| 1710 | March 12 | Birth Thomas Arne, English composer (death 1778) |
| 1699 | March 12 | Death Peder Griffenfeld, Danish statesman (birth 1635) |
| 1685 | March 12 | Birth George Berkeley, Irish theologian (death 1753) |
| 1681 | March 12 | Death Frans van Mieris, Sr., Dutch painter (birth 1635) |
| 1672 | March 12 | Birth Richard Steele, Irish writer and politician (death 1729) |
| 1664 | March 12 | New Jersey becomes a colony of England. |
| 1648 | March 12 | Death Tirso de Molina, Spanish writer (birth 1571) |
| 1647 | March 12 | Birth Victor-Maurice, comte de Broglie, French general (death 1727) |
| 1637 | March 12 | Birth Anne Hyde, wife of James II of England (death 1671) |
| 1628 | March 12 | Death John Bull, English composer |
| 1626 | March 12 | Birth John Aubrey, English antiquary and writer (death 1697) |
| 1622 | March 12 | Ignatius of Loyola, founder of the Jesuits, is canonized a saint by the Catholic Church. |
| 1620 | March 12 | Birth Johann Heinrich Hottinger, Swiss philologist and theologian (death 1667) |
| 1613 | March 12 | Birth André Le Nôtre, French landscape architect (death 1700) |
| 1608 | March 12 | Death Koriki Kiyonaga, Japanese warlord (birth 1530) |
| 1607 | March 12 | Birth Paul Gerhardt, German hymnist (death 1676) |
| 1507 | March 12 | Death Cesare Borgia, Italian general and statesman (birth 1475) |
| 1478 | March 12 | Birth Giuliano di Lorenzo de' Medici, ruler of Florence (death 1516) |
| 1447 | March 12 | Death Shah Rukh, ruler of Persia and Transoxonia (birth 1377) |
| 1374 | March 12 | Death Emperor Go-Kogon of Japan (birth 1336) |
| 1289 | March 12 | Death King Demetre II of Georgia (birth 1259) |
| 1270 | March 12 | Birth Charles of Valois, son of Philip III of France (death 1325) |
| 604 | March 12 | Death Pope Gregory I |
| 538 | March 12 | Witiges, king of the Ostrogoths ends his siege of Rome and retreats to Ravenna, leaving the city in the hands of the victorious Roman general, Belisarius. |