The 2018 Categoría Primera B season (officially known as the 2018 Torneo Águila season for sponsorship reasons) was the 29th season since its founding as Colombia's second division football league. The competition started on 10 February and concluded on 26 November. Cúcuta Deportivo were the champions by defeating Unión Magdalena 3–0 on aggregate score in the final. Both teams were also promoted to the Categoría Primera A.