Big Brother Belgium & Netherlands 1 is the first season of Big Brother Netherlands & Belgium.
After rumors circulating on a Dutch reboot since 2019, RTL decided to keep the reboot quiet until June 8, 2020, when the new season was announced. However, no premiere date was announced and no casting applications were opened. This season would be the first Dutch Big Brother season to air in 15 years and the first Dutch season since Secret Story Netherlands 1 to air, which aired 10 years ago.
On July 23, 2020, RTL5 and SBS announced that Belgians would also be able to participate in the cast, and would compete in a Netherlands vs. Belgium season. This would be the first season Belgian season to air in 14 years. Both channels also announced that the show would air in 2021.