| 30451 | March 18 | Birth | 1986 – Lykke Li, Swedish singer-songwriter |
| 30452 | March 18 | Birth | 1987 – Gabriel Mercado, Argentinian footballer |
| 30453 | March 18 | Birth | 1987 – Cesare Rickler, Italian footballer |
| 30454 | March 18 | Birth | 1987 – Rebecca Soni, American swimmer |
| 30455 | March 18 | Birth | 1987 – Mauro Zárate, Argentinian footballer |
| 30456 | March 18 | Birth | 1989 – Francesco Checcucci, Italian footballer |
| 30457 | March 18 | Birth | 1989 – Lily Collins, English-American actress |
| 30458 | March 18 | Birth | 1989 – Shreevats Goswami, Indian cricketer |
| 30459 | March 18 | Birth | 1989 – Kana Nishino, Japanese singer-songwriter |
| 30460 | March 18 | Birth | 1989 – Paul Marc Rousseau, Canadian guitarist and producer (Silverstein) |
| 30461 | March 18 | Birth | 1990 – Corey Liuget, American football player |
| 30462 | March 18 | Birth | 1991 – Dylan Mattingly, American singer-songwriter and guitarist |
| 30463 | March 18 | Birth | 1991 – Jeric Teng, Filipino basketball player |
| 30464 | March 18 | Birth | 1992 – Ryan Truex, American race car driver |
| 30465 | March 18 | Birth | 1993 – Maziah Mahusin, Bruneian hurdler |
| 30466 | March 18 | Birth | 1993 – Urassaya Sperbund, Thai model and actress |
| 30467 | March 18 | Birth | 1996 – Madeline Carroll, American actress |
| 30468 | March 18 | Birth | 1997 – Ciara Bravo, American actress |
| 30469 | March 18 | Death | 235 – Severus Alexander, Roman emperor (b. 208) |
| 30470 | March 18 | Death | 978 – Edward the Martyr, English king (b. 962) |
| 30471 | March 18 | Death | 1227 – Pope Honorius III (b. 1148) |
| 30472 | March 18 | Death | 1314 – Jacques de Molay, Frankish knight (b. 1244) |
| 30473 | March 18 | Death | 1675 – Arthur Chichester, 1st Earl of Donegall, Irish soldier (b. 1606) |
| 30474 | March 18 | Death | 1689 – John Dixwell, English soldier and politician (b. 1607) |
| 30475 | March 18 | Death | 1696 – Robert Charnock, English academic (b. 1663) |
| 30476 | March 18 | Death | 1715 – William Fraser, 12th Lord Saltoun, Scottish politician (b. 1654) |
| 30477 | March 18 | Death | 1745 – Robert Walpole, English scholar and politician, Prime Minister of the United Kingdom (b. 1676) |
| 30478 | March 18 | Death | 1768 – Laurence Sterne, Irish priest and author (b. 1713) |
| 30479 | March 18 | Death | 1781 – Anne-Robert-Jacques Turgot, Baron de Laune, French economist and politician, French Controller-General of Finances (b. 1727) |
| 30480 | March 18 | Death | 1823 – Jean-Baptiste Bréval, French cellist and composer (b. 1753) |