| 27571 | March 12 | Event | 1971 – The March 12 Memorandum is sent to the Demirel government of Turkey and the government resigns. |
| 27572 | March 12 | Event | 1992 – Mauritius becomes a republic while remaining a member of the Commonwealth of Nations. |
| 27573 | March 12 | Event | 1993 – Several bombs explode in Bombay (Mumbai), India, killing about 300 and injuring hundreds more. |
| 27574 | March 12 | Event | 1993 – 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. |
| 27575 | March 12 | Event | 1993 – The Blizzard of 1993: Snow begins to fall across the eastern portion of the US with tornadoes, thunder snow storms, high winds and record low temperatures. The storm lasts for 30 hours. |
| 27576 | March 12 | Event | 1993 – Janet Reno is sworn in as the United States' first female attorney general. |
| 27577 | March 12 | Event | 1994 – The Church of England ordains its first female priests. |
| 27578 | March 12 | Event | 1999 – Former Warsaw Pact members the Czech Republic, Hungary and Poland join NATO. |
| 27579 | March 12 | Event | 2003 – Zoran Đinđić, Prime Minister of Serbia, is assassinated in Belgrade. |
| 27580 | March 12 | Event | 2004 – The President of South Korea, Roh Moo-hyun, is impeached by its National Assembly: The first such impeachment in the nation's history. |
| 27581 | March 12 | Event | 2005 – Karolos Papoulias becomes President of Greece. |
| 27582 | March 12 | Event | 2009 – Financier Bernard Madoff pleads guilty in New York to scamming $18 billion, the largest in Wall Street history. |
| 27583 | March 12 | Event | 2011 – A reactor at the Fukushima Daiichi Nuclear Power Plant melts and explodes and releases radioactivity into the atmosphere a day after Japan's earthquake. |
| 27584 | March 12 | Event | 2014 – An explosion in the New York City neighborhood of East Harlem kills 8 and injures 70 others. |
| 27585 | March 12 | Birth | 1270 – Charles, Count of Valois (d. 1325) |
| 27586 | March 12 | Birth | 1312 – John de Vere, 7th Earl of Oxford (d. 1360) |
| 27587 | March 12 | Birth | 1479 – Giuliano de' Medici, Duke of Nemours (d. 1516) |
| 27588 | March 12 | Birth | 1607 – Paul Gerhardt, German poet and composer (d. 1676) |
| 27589 | March 12 | Birth | 1613 – André Le Nôtre, French gardener and architect (d. 1700) |
| 27590 | March 12 | Birth | 1620 – Johann Heinrich Hottinger, Swiss philologist and theologian (d. 1667) |
| 27591 | March 12 | Birth | 1626 – John Aubrey, English historian and philosopher (d. 1697) |
| 27592 | March 12 | Birth | 1637 – Anne Hyde, English wife of James II of England (d. 1671) |
| 27593 | March 12 | Birth | 1647 – Victor-Maurice, comte de Broglie, French general (d. 1727) |
| 27594 | March 12 | Birth | 1672 – Richard Steele, Irish-Welsh journalist and politician (d. 1729) |
| 27595 | March 12 | Birth | 1685 – George Berkeley, Irish bishop and philosopher (d. 1753) |
| 27596 | March 12 | Birth | 1710 – Thomas Arne, English composer (d. 1778) |
| 27597 | March 12 | Birth | 1718 – Joseph Damer, 1st Earl of Dorchester, English politician (d. 1798) |
| 27598 | March 12 | Birth | 1781 – Frederica of Baden (d. 1826) |
| 27599 | March 12 | Birth | 1795 – William Lyon Mackenzie, Scottish-Canadian journalist and politician, 1st Mayor of Toronto (d. 1861) |
| 27600 | March 12 | Birth | 1806 – Jane Pierce, American wife of Franklin Pierce, 15th First Lady of the United States (d. 1863) |