The 1980–81 Tercera División season was the 4th season since establishment as the 4th tier.

League tables

Group I

Group II

Group III

Group IV

Group V

Group VI

Group VII

Group VIII

Group IX

Group X

Group XI

Group XII

Group XIII

Promotion playoff

First round

Final Round

Season records Most wins: 28, Real Valladolid Promesas and Poblense. Most draws: 16, Lagun Onak, Bergara and Santomera. Most losses: 30, Toledo. Most goals for: 97, Real Valladolid Promesas. Most goals against: 99, Loja. Most points: 64, Real Valladolid Promesas. Fewest wins: 2, Toledo. Fewest draws: 3, Ponferradina. Fewest losses: 2, Poblense. Fewest goals for: 21, Toledo. Fewest goals against: 16, Poblense. Fewest points: 10, Toledo.

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