The 1972–73 Tercera División was the 39th edition since its establishment.

League tables

Group I

Group II

Group III

Group IV

Promotion playoff

Relegation playoff

Season records Most wins: 24, Salamanca. Most draws: 16, Pegaso and Xerez. Most losses: 25, Llodio and Ejea. Most goals for: 82, Salamanca. Most goals against: 94, Acero. Most points: 59, Salamanca. Fewest wins: 4, Ejea. Fewest draws: 3, San Sebastián. Fewest losses: 3, Salamanca. Fewest goals for: 25, Torrejón and Chantrea. Fewest goals against: 21, Palencia. Fewest points: 17, Ejea.

External links RSSSF Futbolme