| 30565 | March 18 | Holiday and observance | Christian feast day:Alexander of JerusalemCyril of JerusalemEdward the MartyrFridianusSalvator |
| 30566 | March 18 | Holiday and observance | Earliest date on which Holy Wednesday can fall, while April 21 is the latest celebrated on the week before Easter. (Christianity) |
| 30567 | March 18 | Holiday and observance | Flag Day (Aruba) |
| 30568 | March 18 | Holiday and observance | Gallipoli Memorial Day (Turkey) |
| 30569 | March 18 | Holiday and observance | Mens' and Soldiers' Day (Mongolia) |
| 30570 | March 19 | Event | 1279 – A Mongolian victory at the Battle of Yamen ends the Song dynasty in China. |
| 30541 | March 18 | Death | 2012 – Imra Agotić, Croatian general (b. 1943) |
| 30542 | March 18 | Death | 2012 – Furman Bisher, American journalist (b. 1918) |
| 30543 | March 18 | Death | 2012 – William R. Charette, American soldier, Medal of Honor recipient (b. 1932) |
| 30544 | March 18 | Death | 2012 – William G. Moore Jr., American general (b. 1920) |
| 30545 | March 18 | Death | 2012 – George Tupou V of Tonga (b. 1948) |
| 30546 | March 18 | Death | 2012 – Jalal Zolfonun, Iranian setar player and composer (b. 1937) |
| 30547 | March 18 | Death | 2013 – Muhammad Mahmood Alam, Pakistani general and pilot (b. 1935) |
| 30548 | March 18 | Death | 2013 – Mindy Baha El Din, American-Egyptian ornithologist and environmentalist (b. 1958) |
| 30549 | March 18 | Death | 2013 – Henry Bromell, American director, producer, and screenwriter (b. 1947) |
| 30550 | March 18 | Death | 2013 – Clay Ford, American lawyer and politician (b. 1938) |
| 30551 | March 18 | Death | 2013 – Earl Hersh, American baseball player (b. 1932) |
| 30552 | March 18 | Death | 2013 – Robin M. Williams, New Zealand mathematician and academic (b. 1919) |
| 30553 | March 18 | Death | 2014 – Catherine Obianuju Acholonu, Nigerian author, playwright, and academic (b. 1951) |
| 30554 | March 18 | Death | 2014 – Jorge Arvizu, Mexican voice actor (b. 1932) |
| 30555 | March 18 | Death | 2014 – Kaiser Kalambo, Zambian footballer, coach, and manager (b. 1953) |
| 30556 | March 18 | Death | 2014 – Joe Lala, American actor and drummer (Blues Image and Manassas) (b. 1947) |
| 30557 | March 18 | Death | 2014 – Lucius Shepard, American author and critic (b. 1943) |
| 30558 | March 18 | Death | 2014 – Ara Shiraz, Armenian sculptor (b. 1941) |
| 30559 | March 18 | Death | 2015 – Zhao Dayu, Chinese footballer and manager (b. 1961) |
| 30560 | March 18 | Death | 2015 – Roy Doty, American illustrator (b. 1922) |
| 30561 | March 18 | Death | 2015 – Thomas Hopko, American priest and theologian (b. 1939) |
| 30562 | March 18 | Death | 2015 – Grace Ogot, Kenyan nurse, journalist, and politician (b. 1930) |
| 30563 | March 18 | Death | 2015 – Shaw Taylor, English actor and television host (b. 1924) |
| 30564 | March 18 | Holiday and observance | Anniversary of the Oil Expropriation (Mexico) |