1965–66 Segunda División

The 1965–66 Segunda División season was the 35th since its establishment and was played between 5 September 1965 and 3 April 1966.

Overview before the season
32 teams joined the league, including 4 relegated from the 1964–65 La Liga and 4 promoted from the 1964–65 Tercera División.


 * Relegated from La Liga:
 * Murcia
 * Levante
 * Oviedo
 * Deportivo La Coruña


 * Promoted from Tercera División:
 * Condal
 * Lérida
 * Rayo Vallecano
 * Badajoz