The 2021 Belgian Athletics Championships (, ) was the year's national outdoor track and field championships for Belgium. It was held from 26 to 27 June at the King Baudouin Stadium in Brussels, with the exception of the hammer throw events which took place in Kessel-Lo. The national championships in 10,000 metres and women's 3000 metres steeplechase took place on Saturday 12 June in Gentbrugge.