Events That Happened on March 21
- 1960 CESharpeville massacre
- 1989 CEBasel Convention
- 1779 CETreaty of Aynalıkavak
- 1801 CETreaty of Aranjuez
- 1950 CEConvention for the Suppression of the Traffic in Persons and of the Exploitation of the Prostitution of Others
- 1986 CEVienna Convention on the Law of Treaties Between States and International Organizations or Between International Organizations
- 2014 CEUkraine–European Union Association Agreement
- 2018 CEAfrican Continental Free Trade Agreement
- 1937 CEPonce massacre
- 2025 CEFambita mosque attack
- 1325 CETreaty of Trausnitz
- 1804 CEOld Civil Code
- 2002 CEKing George Street bombing
- 1990 CEPoland-United States Bilateral Investment Treaty
- 1994 CEPeople's Republic of China-Ecuador Bilateral Investment Treaty
- 1995 CEGermany-Honduras Bilateral Investment Treaty
- 1995 CEFrance-Romania Bilateral Investment Treaty
- 1995 CEBrazil-France Bilateral Investment Treaty
- 1996 CEEcuador-Romania Bilateral Investment Treaty
- 1996 CEEcuador-Germany Bilateral Investment Treaty
- 1997 CECroatia-Germany Bilateral Investment Treaty
- 2000 CEAlgeria-Indonesia Bilateral Investment Treaty
- 2002 CEFinland-Uruguay Bilateral Investment Treaty
Natural Disasters on March 21
Records from scientific disaster catalogs that fall on this calendar day. All disaster records
- 1829 CEEarthquake — Spain, Torrevieja, Murcia· 2,000 deaths
- 1977 CEEarthquake — Iran, Bandar Abbas (Mw 6.7)· 167 deaths
- 1982 CEEarthquake and tsunami — Japan, Hokkaido, Urakawa, Hiroo (Ms 6.7)· 110 deaths
- 2002 CEFlood: Philippines (2002-03-21)· 35 deaths
- 1947 CEIce-Jam Flooding Including Debris: Germany (1947-03-21)· 23 deaths
- 2023 CEEarthquake — Afghanistan, Laghman, Pakistan (Mw 6.5)· 19 deaths
- 1990 CEFlood: India (1990-03-21)· 17 deaths
- 2017 CEFlood: Angola (2017-03-21)· 11 deaths
- 2020 CEFlood: Afghanistan (2020-03-21)· 11 deaths
- 1969 CEDidicas· 3 deaths
- 2001 CEFlood: Portugal (2001-03-21)· 3 deaths
- 2016 CEFlood: Indonesia (2016-03-21)· 3 deaths
- 2019 CEEarthquake — Tanzania, Songwe, Mbeya (Mw 5.5)· 1 deaths
- 2001 CEFluvial (Riverine) Flooding: Portugal (2001-03-21)· 1 deaths
- 2002 CEFluvial (Riverine) Flooding: Austria (2002-03-21)· 1 deaths
- 2002 CEFlood: Austria,Hungary (2002-03-21)· 1 deaths
- 2001 CEFlood: France (2001-03-21)· 0 deaths
- 2018 CEFlood: United States of America (2018-03-21)· 0 deaths
- 1978 CEFluvial (Riverine) Flooding: Albania (1978-03-21)· 0 deaths
- 1998 CEFlood: United States of America (1998-03-21)· 0 deaths
- 1939 CEM 7.5 - South Indian Ocean
- 1954 CEEarthquake — Myanmar / India, Calcutta, Cuttack, Bhagalpur (Ms 7.4)
- 1734 CE1734 North Atlantic Ocean and Iceland earthquake (Mw 7.4)