| Competition: | Segunda División |
| Season: | 2008–09 |
| Winners: | Xerez |
| Promoted: | Xerez Real Zaragoza Tenerife |
| Relegated: | Alavés Alicante Eibar Sevilla Atlético |
| League Topscorer: |  Nino |
| Matches: | 462 |
| Total Goals: | 1160 |
| Prevseason: | 2007–08 |
| Nextseason: | 2009–10 |
The 2008–09 Segunda División season (known from that season as Liga Adelante for sponsorship reasons) was the 78th since its establishment. The first matches of the season were played on 30 August 2008, and the season ended on 21 June 2009. Real Zaragoza, Real Murcia and Levante were the teams relegated from La Liga the previous season. Alicante, Girona, Huesca and Rayo Vallecano were the teams promoted from Segunda División B the previous season.
The first goal of the season was scored by Alexandre Geijo, who scored in the 11th minute for Levante against Real Zaragoza in the early kick-off. The first red card of the season was given to Paco Peña from Real Murcia after a challenge on Sergio Pachón in their opening match against Rayo Vallecano. The first hat-trick was scored by Sebastián Abreu in the match between Xerez and Real Sociedad.
The 2008–09 Segunda División was made up of the following teams:
Last updated 21 June 2009
| Goalscorers | Goals | Penalties | Team |
|---|---|---|---|
| Nino | 29 | 4 | Tenerife |
 Ewerthon | 28 | 5 | Real Zaragoza |
| Marcos Márquez | 21 | 7 | Las Palmas |
| Alejandro Alfaro | 20 | 0 | Tenerife |
| Momo | 17 | 3 | Xerez |
 Leonardo Ulloa | 16 | 2 | Castellón |
| 15 | 2 | Salamanca | |
| Rubén Navarro | 15 | 1 | |
| Rubén Castro | 14 | 3 | Huesca |
| Víctor | 14 | 2 | |
Last updated 21 June 2009
| Goalkeeper | Goals | Matches | Average | Team |
|---|---|---|---|---|
| David Cobeño | 35 | 40 | 0.88 | Rayo Vallecano |
| Claudio Bravo | 28 | 32 | 0.88 | Real Sociedad |
| Chema | 41 | 41 | 1 | Xerez |
| Carlos Sánchez | 34 | 34 | 1 | Castellón |
| Alberto Cifuentes | 34 | 33 | 1.03 | Salamanca |
| Juan Calatayud | 42 | 40 | 1.05 | Hércules |
| Eduardo Navarro | 39 | 36 | 1.08 | Huesca |
| Willy Caballero | 40 | 36 | 1.11 | Elche |
| Rubén Pérez | 38 | 33 | 1.15 | Gimnàstic de Tarragona |
| Roberto Santamaría | 45 | 39 | 1.15 | Las Palmas |
| Autonomous community | Number of teams | Teams | |
|---|---|---|---|
| 1 | 5 | Alicante, Castellón, Elche, Hércules and Levante | |
| 2 | 3 | Córdoba, Sevilla Atlético and Xerez | |
| 3 | Alavés, Eibar and Real Sociedad | ||
| 4 | 2 | Huesca and Zaragoza | |
| 2 | Las Palmas and Tenerife | ||
| 2 | Gimnàstic and Girona | ||
| 7 | 1 | Albacete | |
| 1 | Salamanca | ||
| 1 | Celta | ||
| 1 | Rayo Vallecano | ||
| 1 | Murcia | ||