The inaugural edition of the Belgian Open took place in 1910. The tournament, hosted by the Royal Golf Club Belgium, was played over 36 holes that year. It wasn't until 1928 that the competition was expanded to its new format of 72 holes. The tournament was not organized during the First or Second World Wars. Belgian golfer Flory Van Donck won the tournament five times between 1939 and 1956. Since 1978, the Belgian Open has been included in the European Tour.
PietersProductions, the events agency co-founded by Thomas Pieters, took over the organization of the Belgian Open in 2018. After an absence of 18 years, the agency put the Belgian Open back on the calendar of the European Tour. The Belgian Open was reintroduced under its new name: the Belgian Knockout.