The 2015 Tercera División play-offs to Segunda División B from Tercera División (Promotion play-offs) were the final playoffs for the promotion from 2014–15 Tercera División to 2015–16 Segunda División B. The first four teams in each group took part in the play-off.
The eighteen group winners have the opportunity to be promoted directly to Segunda División B. The eighteen group winners were drawn into a two-legged series where the nine winners will promote to Segunda División B. The nine losing clubs will enter the play-off round for the last nine promotion spots.
The eighteen runners-up were drawn against one of the eighteen fourth-placed clubs outside their group and the eighteen third-placed clubs were drawn against one another in a two-legged series. The twenty-seven winners will advance with the nine losing clubs from the champions' series to determine the eighteen teams that will enter the last two-legged series for the last nine promotion spots. In all the playoff series, the lower-ranked club play at home first. Whenever there is a tie in position (e.g. like the group winners in the champions' series or the third-placed teams in the first round), a draw determines the club to play at home first.
The draw took place in the RFEF headquarters, in Las Rozas (Madrid), on 18 May 2015.
| Group | Team |
|---|---|
| 1 | Pontevedra |
| 2 | Condal |
| 3 | Laredo |
| 4 | Portugalete |
| 5 | Ascó |
| 6 | Castellón |
| 7 | Rayo Majadahonda |
| 8 | Arandina |
| 9 | Linares |
| Group | Team |
|---|---|
| 10 | Algeciras |
| 11 | Formentera |
| 12 | Mensajero |
| 13 | Jumilla |
| 14 | Mérida |
| 15 | Peña Sport |
| 16 | Varea |
| 17 | Ebro |
| 18 | Talavera de la Reina |
|}
The draw took place in the RFEF headquarters, in Las Rozas (Madrid), on 18 May 2014.
| Group | Position | Team |
|---|---|---|
| 1 | 2nd | Deportivo La Coruña B |
| 2 | 2nd | Caudal |
| 3 | 2nd | Gimnástica Torrelavega |
| 4 | 2nd | Gernika |
| 5 | 2nd | Pobla de Mafumet |
| 6 | 2nd | Atlético Levante |
| 7 | 2nd | Navalcarnero |
| 8 | 2nd | Numancia B |
| 9 | 2nd | Atlético Malagueño |
| 10 | 2nd | San Fernando |
| 11 | 2nd | Llosetense |
| 12 | 2nd | Lanzarote |
| 13 | 2nd | Murcia Imperial |
| 14 | 2nd | Extremadura |
| 15 | 2nd | |
| 16 | 2nd | Calahorra |
| 17 | 2nd | Teruel |
| 18 | 2nd | Almansa |
| Group | Position | Team |
|---|---|---|
| 1 | 3rd | Cerceda |
| 2 | 3rd | Oviedo B |
| 3 | 3rd | Racing de Santander B |
| 4 | 3rd | Arenas |
| 5 | 3rd | Europa |
| 6 | 3rd | Novelda |
| 7 | 3rd | Alcobendas Sport |
| 8 | 3rd | Palencia |
| 9 | 3rd | San Pedro |
| 10 | 3rd | Gerena |
| 11 | 3rd | Peña Deportiva |
| 12 | 3rd | Marino |
| 13 | 3rd | El Castillo |
| 14 | 3rd | Jerez |
| 15 | 3rd | Izarra |
| 16 | 3rd | SD Logroñés |
| 17 | 3rd | Sariñena |
| 18 | 3rd | Quintanar del Rey |
| Group | Position | Team |
|---|---|---|
| 1 | 4th | Choco |
| 2 | 4th | Tuilla |
| 3 | 4th | Cayón |
| 4 | 4th | Durango |
| 5 | 4th | Figueres |
| 6 | 5th | Ontinyent |
| 7 | 4th | Unión Adarve |
| 8 | 4th | Gimnástica Segoviana |
| 9 | 4th | Martos |
| 10 | 4th | Atlético Sanluqueño |
| 11 | 4th | Mercadal |
| 12 | 4th | Sporting San José |
| 13 | 4th | Águilas |
| 14 | 4th | Badajoz |
| 15 | 4th | Osasuna B |
| 16 | 4th | Haro Deportivo |
| 17 | 4th | Tarazona |
| 18 | 4th | Manzanares |
|}
The draw was held in the RFEF headquarters, in Las Rozas (Madrid).
| Group | Position | Team |
|---|---|---|
| 1 | 1st | Pontevedra |
| 2 | 1st | Condal |
| 3 | 1st | Laredo |
| 4 | 1st | Portugalete |
| 5 | 1st | Ascó |
| 6 | 1st | Castellón |
| 10 | 1st | Algeciras |
| 11 | 1st | Formentera |
| 16 | 1st | Varea |
| Group | Position | Team |
|---|---|---|
| 1 | 2nd | Deportivo La Coruña B |
| 3 | 2nd | |
| 4 | 2nd | Gernika |
| 5 | 2nd | Pobla de Mafumet |
| 6 | 2nd | Atlético Levante |
| 8 | 2nd | Numancia B |
| 10 | 2nd | San Fernando |
| 11 | 2nd | Llosetense |
| 13 | 2nd | Murcia Imperial |
| 14 | 2nd | Extremadura |
| 15 | 2nd | San Juan |
| Group | Position | Team |
|---|---|---|
| 4 | 3rd | Arenas |
| 8 | 3rd | Palencia |
| 9 | 3rd | San Pedro |
| 10 | 3rd | Gerena |
| 11 | 3rd | Peña Deportiva |
| 14 | 3rd | Jerez |
| 15 | 3rd | Izarra |
| 16 | 3rd | SD Logroñés |
| 17 | 3rd | Sariñena |
| Group | Position | Team |
|---|---|---|
| 3 | 4th | Cayón |
| 8 | 4th | |
| 9 | 4th | Martos |
| 10 | 4th | Atlético Sanluqueño |
| 15 | 4th | Osasuna B |
| 16 | 4th | Haro |
| 18 | 4th | Manzanares |
|}
| Group | Position | Team |
|---|---|---|
| 1 | 1st | Pontevedra |
| 4 | 1st | Portugalete |
| 10 | 1st | Algeciras |
| Group | Position | Team |
|---|---|---|
| 4 | 2nd | Gernika |
| 5 | 2nd | Pobla de Mafumet |
| 6 | 2nd | Atlético Levante |
| 8 | 2nd | Numancia B |
| 11 | 2nd | Llosetense |
| Group | Position | Team |
|---|---|---|
| 4 | 3rd | Arenas |
| 9 | 3rd | San Pedro |
| 10 | 3rd | Gerena |
| 15 | 3rd | Izarra |
| 16 | 3rd | SD Logroñés |
| Group | Position | Team | |
|---|---|---|---|
| 3 | 4th | Cayón | |
| 8 | 4th | ||
| 10 | 4th | Atlético Sanluqueño | |
| 15 | 4th | Osasuna B | |
| 16 | 4th | Haro |
|}