Portal:Belgium/Anniversaries/April/April 20
- 1920: opening ceremony of the 1920 Summer Olympics in Antwerp
- 1932: death of Edgard Colle, chess player, known for the Colle System opening
- 1976: birth of Big Ben, world champion show jumping horse, inducted in the Canadian Sports Hall of Fame
- 2006: the law allowing adoption by same-sex couples, which had already been passed by the Chamber of Representatives, is passed by the Senate with 34 votes in favour, 33 votes against and two abstentions