| 2021 Belgian Athletics Championships | |
| Host City: | Brussels, Belgium |
| Dates: | 26–27 June |
| Stadium: | King Baudouin Stadium |
| Previous: | 2020 |
| Next: | 2022 |
The 2021 Belgian Athletics Championships (nl|Belgische kampioenschappen atletiek 2021, fr|Championnats de Belgique d'athlétisme 2021) 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.
| 100 metres | 10.65 | 10.71 | 10.74 | ||||
| 200 metres | 21.08 | 21.11 | 21.35 | ||||
| 400 metres | 45.34 | 46.06 | 46.08 | ||||
| 800 metres | 1:48.45 | 1:48.79 | 1:49.28 | ||||
| 1500 metres | 3:40.51 | 3:44.73 | 3:45.59 | ||||
| 5000 metres | 13:33.98 | 13:39.53 | 14:08.52 | ||||
| 10,000 metres | 29:38.50 | 29:44.48 | 29:54.64 | ||||
| 110 m hurdles | 13.32 | 13.93 | 14.13 | ||||
| 400 m hurdles | 50.58 | 50.73 | 51.54 | ||||
| 3000 m s'chase | 9:06.03 | 9:11.62 | 9:21.96 | ||||
| Long jump | 7.50 m (-0.3 m/s) | 7.24 m (+1.4 m/s) | 7.19 m (+0.7 m/s) | ||||
| Triple jump | 15.09 m (+0.8 m/s) | 14.91 m (+0.2 m/s) | 14.51 m (+1.2 m/s) | ||||
| High jump | 2.23 m | 2.15 m | 2.15 m | ||||
| Pole vault | 5.25 m | 5.00 m | 4.60 m | ||||
| Shot put | 18.10 m | 17.32 m | 15.66 m | ||||
| Discus throw | 61.36 m | 49.32 m | 48.68 m | ||||
| Javelin throw | 71.52 m | 62.16 m | 61.59 m | ||||
| Hammer throw | 64.00 m | 58.03 m | 57.58 m |
| 100 metres | 11.39 | 11.71 | 11.72 | ||||
| 200 metres | 23.30 | 23.49 | 23.70 | ||||
| 400 metres | 52.72 | 53.41 | 53.43 | ||||
| 800 metres | 2:05.85 | 2:06.16 | 2:06.77 | ||||
| 1500 metres | 4:15.09 | 4:16.33 | 4:17.92 | ||||
| 5000 metres | 16:34.26 | 16:36.59 | 16:51.74 | ||||
| 10,000 metres | 34:26.65 | 35:49.84 | 36:36.48 | ||||
| 100 m hurdles | 12.94 | 13.26 | 13.86 | ||||
| 400 m hurdles | 57.28 | 59.68 | 60.30 | ||||
| 3000 m s'chase | 10:41.21 | 11:36.51 | 11:37.70 | ||||
| Long jump | 6.04 m (-0.3 m/s) | 6.04 m (+0.3 m/s) | 5.97 m (-1.1 m/s) | ||||
| Triple jump | 12.89 m (+0.0 m/s) | 12.70 m (+1.2 m/s) | 12.36 m (+1.2 m/s) | ||||
| High jump | 1.90 m | 1.88 m | 1.88 m | ||||
| Pole vault | 4.40 m | 4.20 m | 4.10 m | ||||
| Shot put | 15.18 m | 14.99 m | 13.54 m | ||||
| Discus throw | 51.45 m | 49.92 m | 49.71 m | ||||
| Javelin throw | 46.23 m | 43.54 m | 43.17 m | ||||
| Hammer throw | 68.92 m | 57.57 m | 51.89 m |