2018 Tercera División play-offs
Group Pos Team
1 2nd Bergantiños
2 2nd Langreo
3 2nd Escobedo
4 2nd Portugalete
5 2nd Sant Andreu
6 2nd Castellón
7 2nd Getafe B
8 2nd Arandina
9 2nd Almería B
10 2nd Ceuta
11 2nd Poblense
12 2nd Mensajero
13 2nd Mar Menor
14 2nd Cacereño
15 2nd San Juan
16 2nd SD Logroñés
17 2nd Borja
18 2nd Villarrobledo
The 2018 Tercera División play-offs to Segunda División B from Tercera División (Promotion play-offs) were the final playoffs for the promotion from 2017-18 Tercera División to 2018-19 Segunda División B. The first four teams in each group took part in the play-off.