| 30091 | March 17 | Death | 2014 – Gene Feist, American director and playwright, co-founded the Roundabout Theatre Company (b. 1923) |
| 30092 | March 17 | Death | 2014 – Marek Galiński, Polish cyclist (b. 1974) |
| 30093 | March 17 | Death | 2014 – Joseph Kerman, American musicologist and critic (b. 1924) |
| 30094 | March 17 | Death | 2014 – Rachel Lambert Mellon, American gardener, philanthropist, and art collector (b. 1910) |
| 30095 | March 17 | Death | 2014 – Paddy McGuigan, Irish singer-songwriter (The Barleycorn) (b. 1939) |
| 30096 | March 17 | Death | 2014 – Oswald Morris, English cinematographer (b. 1915) |
| 30097 | March 17 | Death | 2014 – L'Wren Scott, American model and fashion designer (b. 1964) |
| 30098 | March 17 | Death | 2015 – Ashley Adams, Australian target shooter (b. 1955) |
| 30099 | March 17 | Death | 2015 – Bob Appleyard, English cricketer and businessman (b. 1924) |
| 30100 | March 17 | Death | 2015 – Raymond D. Fowler, American psychologist and academic (b. 1930) |
| 30101 | March 17 | Death | 2015 – Kuniyoshi Kaneko, Japanese painter, photographer and illustrator (b. 1936) |
| 30102 | March 17 | Death | 2015 – Frank Perris, Canadian motorcycle racer (b. 1931) |
| 30103 | March 17 | Death | 2015 – Guido Zappa, Italian mathematician and theorist (b. 1915) |
| 30104 | March 17 | Holiday and observance | Children's Day (Bangladesh) |
| 30105 | March 17 | Holiday and observance | Christian feast day:Alexius of Rome (Eastern Church)Gertrude of NivellesJohn SarkanderJoseph of Arimathea (Western Church)PatrickMarch 17 (Eastern Orthodox liturgics) |
| 30106 | March 17 | Holiday and observance | Evacuation Day (Suffolk County, Massachusetts) |
| 30107 | March 17 | Holiday and observance | Liberalia, in honor of Liber Pater. Considered by some to be part of Agonalia. (Ancient Rome) |
| 30108 | March 17 | Holiday and observance | National Muay Thai Day |
| 30109 | March 17 | Holiday and observance | Saint Patrick's Day, a public holiday in Ireland, Montserrat and the Canadian province of Newfoundland and Labrador, widely celebrated in the English-speaking world and to a lesser degree, elsewhere. |
| 30110 | March 18 | Event | 37 – The Roman Senate annuls Tiberius's will and proclaims Caligula emperor. |
| 30111 | March 18 | Event | 633 – Ridda wars: The Arabian Peninsula is united under the central authority of Caliph Abu Bakr. |
| 30112 | March 18 | Event | 1229 – Frederick II, Holy Roman Emperor, declares himself King of Jerusalem in the Sixth Crusade. |
| 30113 | March 18 | Event | 1241 – First Mongol invasion of Poland: Mongols overwhelm Polish armies in Kraków in the Battle of Chmielnik and plunder the city. |
| 30114 | March 18 | Event | 1314 – Jacques de Molay, the 23rd and the last Grand Master of the Knights Templar, is burned at the stake. |
| 30115 | March 18 | Event | 1438 – Albert II of Habsburg becomes Holy Roman Emperor. |
| 30116 | March 18 | Event | 1608 – Susenyos is formally crowned Emperor of Ethiopia. |
| 30117 | March 18 | Event | 1644 – The Third Anglo-Powhatan War begins in the Colony of Virginia. |
| 30118 | March 18 | Event | 1741 – New York governor George Clarke's complex at Fort George is burned in an arson attack, starting the New York Conspiracy of 1741. |
| 30119 | March 18 | Event | 1766 – American Revolution: The British Parliament repeals the Stamp Act. |
| 30120 | March 18 | Event | 1793 – The first republic in Germany, the Republic of Mainz, is declared by Andreas Joseph Hofmann. |