2005 Segunda División B play-offs
The 2005 Segunda División B play-offs were the final playoffs for promotion from 2004–05 Segunda División B to the 2005–06 Segunda División. The four first-placed teams in each of the four Segunda División B groups played the Playoffs de Ascenso, and the four last-placed teams in Segunda División were relegated to Segunda División B.
It was won by Real Madrid B, beating UB Conquense 0–1 in the final at the Santiago Bernabéu, courtesy of a goal from.
Teams for 2004/2005 play-off
- RSD Alcalá
- SD Ponferradina
- AD Ceuta
- Hércules CF
- Sevilla B
- Zamora CF
- CD Castellón
- Universidad de Las Palmas CF
- Alicante CF
- Rayo Vallecano
- Real Zaragoza B
- Lorca Deportiva CF
- Real Unión
- Burgos CF
- UB Conquense
- Real Madrid B
Eliminatories
Second round
Group A--Second Eliminatory- Home Match
| 18-Jun-2005 | RSD Alcalá | 1–3 | Hercules CF | Stadium:Virgen del Val |
- Away Match
| 26-Jun-2005 | Hercules CF | 1–1 | RSD Alcalá | Stadium:José Rico Pérez |
Promoted to Segunda División: Hércules CF
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Group B--Second Eliminatory
- Home Match
| 19-Jun-2005 | Zamora CF | 2–1 | CD Castellón | Stadium:Ruta de la Plata |
- Away Match
| 26-Jun-2005 | CD Castellón | 1–0 | Zamora CF | Stadium:Nou Castalia |
Promoted to Segunda División: CD Castellón
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Group C--Second Eliminatory
- Home Match
| 19-Jun-2005 | Lorca CF | 1–2 | Real Unión | Stadium:Francisco Artes Carrasco |
- Away Match
| 26-Jun-2005 | Real Unión | 1–3 | Lorca FC | Stadium:Stadium Gal |
Promoted to Segunda División: Lorca Deportiva CF
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Group D--Second Eliminatory
- Home Match
| 18-Jun-2005 | UB Conquense | 0–2 | Real Madrid B | Stadium:La Fuensanta |
- Away Match
| 26-Jun-2005 | Real Madrid B | 0–1 | UB Conquense | Stadium: Santiago Bernabéu |
Promoted to Segunda División: '''Real Madrid B '''