The 2021 Belgian Indoor Athletics Championships (Dutch: Belgische kampioenschappen indoor atletiek 2021, French: Championnats de Belgique d'athlétisme en salle 2021) was the year's national championship in indoor track and field for Belgium. It was held on Saturday 20 February at the Complexe sportif de Blocry in Louvain-la-Neuve. A total of 16 events, 8 for men and 8 for women, were contested. The competition was heavily affected by restrictions due to the COVID-19 pandemic, with several events abandoned due to lack of entries and all events having greatly reduced numbers of entries. The competition was not held before the public. In spite of restrictions, women's pole vaulter Fanny Smets broke the Belgian indoor record with a clearance of 4.53 m.^[1][2][3]