The 1945–46 Tercera División was the tenth edition of the Spanish third national tier. The competition was divided into 3 phases.
Format
The division comprised 100 clubs in 10 geographic groups. The top 3 clubs in each group (30 in total) progressed to the Second Phase. The Second Phase comprised 5 groups of 6 clubs, each club playing 10 matches. The 5 group winners progressed to the Final Phase - a group of 5 clubs, each playing 8 matches. The top two teams were promoted to the Segunda División and the third-placed team played off against the 12th placed team in the Segunda División.
Regular season
Group 1
Group 2
Group 3
Group 4
Group 5
Group 6
Group 7
Group 8
Group 9
Group 10
Group 10 repechage
Replay:
Calavera was withdraw of this group before the start the competition. Between Cadiz and Tetuán was played a match to play on this group, Cádiz promoted.
Second phase
Group 1
Group 2
Group 3
Group 4
Group 5
Final phase
Group
Promotion/relegation playoff
Note: Baracaldo were promoted to the Segunda División.
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