Categoría Primera B
| Organising body | DIMAYOR |
|---|---|
| Founded | January 29, 1991 |
| Country | Colombia |
| Confederation | CONMEBOL |
| Number of clubs | 16 |
| Level on pyramid | 2 |
| Promotion to | Categoría Primera A |
| Domestic cup(s) | Copa Colombia |
| Current champions | Unión Magdalena (2nd title) (2024) |
| Most championships | Atlético Huila (4 titles) |
| Broadcaster(s) | Win Sports Win+ Fútbol |
| Website | dimayor.com.co |
| Current: 2025 season | |
Categoría Primera B, commonly referred to as Torneo BetPlay Dimayor due to sponsorship by online betting company BetPlay, is the second-division football league in Colombia. The tournament was inaugurated on 29 January 1991.