The 2009 Categoría Primera B season, officially known as the 2009 Copa Premier season for sponsorship reasons) was the 20th season since its founding as Colombia's second division football league.
Teams
Starting from this season, Córdoba moved from Cereté to Sincelejo and was rebranded as Atlético de la Sabana, while Girardot moved to Palmira and became Deportes Palmira. Dépor moved from Jamundí to Cali, and Expreso Rojo moved from Fusagasugá to Zipaquirá.
Torneo Apertura
First stage
Group A
Group B
Semifinals
Group A
Group B
Finals
Tied 3–3 on aggregate, Cortuluá won on penalties.
Torneo Finalización
First stage
Group A
Group B
Semifinals
Group A
Group B
Finals
Atlético Bucaramanga won 3–2 on aggregate.
Championship final
Cortuluá won 4–1 on aggregate.
Promotion/relegation playoff
As the second worst team in the 2009 Categoría Primera A relegation table, Deportivo Pereira had to play a two-legged tie against Atlético Bucaramanga, the Primera B runners-up. As the Primera A team, Deportivo Pereira played the second leg at home. The winner competed in the Primera A for the 2009 season, while the loser competed in the Primera B.