The 1970–71 Tercera División season was the 37th since its establishment.
League tables
Group I
Group II
Group III
Group IV
Promotion playoff
Relegation playoff
Season records Most wins: 28, Cultural Leonesa and Ourense. Most draws: 15, Mirandés. Most losses: 29, Ejea. Most goals for: 90, Cultural Leonesa. Most goals against: 89, Toluca. Most points: 61, Cultural Leonesa. Fewest wins: 4, Ejea. Fewest draws: 4, Ourense, Sestao, Carabanchel and Tortosa. Fewest losses: 5, Cultural Leonesa and Xerez. Fewest goals for: 24, Ejea. Fewest goals against: 20, Ourense and Tenerife. Fewest points: 13, Ejea.
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