Portal:Belgium/Anniversaries/October/October 3
- 818: death of Ermengarde of Hesbaye, wife of Louis the Pious, mother of Lothar I, grandmother of Charles the Bald
- 1871: birth of Stijn Streuvels, writer
- 1944: birth of Pierre Deligne (picture), mathematician
- 1980: death of Albéric O'Kelly de Galway, World Champion in correspondence chess between 1959 and 1962
- 2001: Belgian airline SABENA filed for legal protection