| SEABA Under-18 Championship | |
| Last Season: | 2024 SEABA Under-18 Championship |
| Founded: | 1996 |
| Country: | SEABA member nations |
| Continent: | FIBA Asia (Asia) |
| Champion: | (8th title) |
| Most Champs: | (8 titles) |
The SEABA Under-18 Championship is an under-18 basketball championship in the International Basketball Federation's Southeast Asia Basketball Association, one of FIBA Asia's subzone. The event started in 1996 and is held bi-annually (except in 2000). The winners represent SEABA in the FIBA Asia Under-18 Championship.
The Philippines were the defending champions, and the most successful team in the subzone, have won their fifth straight title since 2008 and their eight title overall. Malaysia have won the other two titles, in 2002 and 2006 and consistently the second-best team in the region.
| width=10% | Year | width=15% | Host | width=20% | Champion | width=20% | Second Place | width=20% | Third Place | width=20% | Fourth Place |
|---|---|---|---|---|---|---|---|---|---|---|---|
| 1996 Details | Santa Cruz | ||||||||||
| 1998 Details |  Bangkok | ||||||||||
| 2002 Details | Kuala Lumpur | ||||||||||
| 2004 Details | Lucena | ||||||||||
| 2006[1] Details | Segamat | ||||||||||
| 2008 Details | Kuala Lumpur | ||||||||||
| 2010 Details | Yangon | ||||||||||
| 2012 Details | Singapore | ||||||||||
| 2014 Details | Tawau | ||||||||||
| 2016 Details | Medan | ||||||||||
| 2024[2] Details | Kuala Lumpur |