The 1965–66 Tercera División season was the 30th season since its establishment.
League table
Group 1
Group 2
Group 3
Group 4
Group 5
Group 6 / 7
Group 8
Group 9
Group 10
Group 11
Group 12
Group 13
Group 14
Group 15
Play-offs
Promotion/relegation Segunda División
First round
Tiebreaker:
Marbella received a bye.
Cartagena was qualified by beating 11 to 10 the number of corners, in the tiebreaker match.
Second round
Tiebreaker:
Final Round
Tiebreaker:
Continue in Segunda DivisiónLangreoEuropaConstancia At. Ceuta
Play-offs (champions)
First round
Logroñés received a bye.
Second round
Tiebreaker:
Promoted to Segunda DivisiónFerrolTorrelavegaLogroñés Castellón
External links RSSSF Futbolme