| Brunei Under-21 | |
| Badge: | File:Flag of Brunei.svg |
| Nickname: | Tabuan Muda (Young Wasps) |
| Association: | FABD |
| Coach: | Aminuddin Jumat |
| Home Stadium: | Sultan Hassanal Bolkiah Stadium |
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| First Game: | Brunei 1–6 (Manila, Philippines; 16 April 1970) |
| Largest Win: | Brunei 6–0 (Guam; 20 June 2000) Brunei 6–0 (Paju, South Korea; 27 March 2000) |
| Largest Loss: | 12–0 Brunei (Bangkok, Thailand; 21 April 1972) 12–0 Brunei (Palembang, Indonesia; 13 August 2005) |
| Regional Name: | AFC U-20 Championship |
| Regional Cup Apps: | 4 |
| Regional Cup First: | 1970 |
| Regional Cup Best: | Group Stage (4 Times) |
| Badge Size: | 190px |
Brunei national under-21 football team is the under-21 football team of Brunei. The team participates in the Hassanal Bolkiah Trophy.
| Year | Round | GP | W | D | L | GS | GA | |
|---|---|---|---|---|---|---|---|---|
| 2002 | Group Stage | 4 | 1 | 1 | 2 | 4 | 12 | |
| 2005 | Group Stage | 3 | 2 | 0 | 1 | 4 | 7 | |
| 2007 | Group Stage | 3 | 1 | 1 | 1 | 6 | 7 | |
| 2012 | Champions | 6 | 5 | 0 | 1 | 13 | 6 | |
| 2014 | Group Stage | 5 | 3 | 1 | 1 | 10 | 6 | |
| 2018 | Group Stage | 3 | 1 | 0 | 2 | 2 | 3 | |
| Total | 6/6 | 24 | 13 | 3 | 8 | 39 | 41 | |