1998–99 Segunda División
The 1998–99 Segunda División season saw 22 teams participate in the second flight Spanish league. Málaga CF, CD Numancia, Sevilla FC and Rayo Vallecano were promoted to Primera División. RCD Mallorca B, Barcelona B, Hércules CF and CD Ourense were relegated to Segunda División B.
Teams
| Team | Home city | Stadium |
| Albacete | Albacete | Carlos Belmonte |
| Atlético Madrid B | Madrid | Cerro del Espino |
| Badajoz | Badajoz | Nuevo Vivero |
| Barcelona B | Barcelona | Mini Estadi |
| Compostela | Santiago de Compostela | San Lázaro |
| Eibar | Eibar | Ipurua |
| Hércules | Alicante | José Rico Pérez |
| Las Palmas | Las Palmas | Insular |
| Leganés | Leganés | Butarque |
| Lleida | Lleida | Camp d'Esports |
| Logroñés | Logroño | Las Gaunas |
| Málaga | Málaga | La Rosaleda |
| Mallorca B | Palma de Mallorca | Lluís Sitjar |
| Mérida | Mérida | Romano |
| Numancia | Soria | Los Pajaritos |
| Osasuna | Pamplona | El Sadar |
| Ourense | Ourense | O Couto |
| Rayo Vallecano | Madrid | Vallecas |
| Recreativo de Huelva | Huelva | Nuevo Colombino |
| Sevilla | Seville | Ramón Sánchez Pizjuán |
| Sporting de Gijón | Gijón | El Molinón |
| Toledo | Toledo | Salto del Caballo |
Teams by Autonomous Community
| Autonomous community | Number of teams | Teams | |
| 1 | 3 | Málaga, Recreativo, Sevilla | |
| 1 | 3 | Atlético Madrid B, Leganés, Rayo Vallecano | |
| 3 | 2 | Albacete, Toledo | |
| 3 | 2 | Barcelona B, Lleida | |
| 3 | 2 | Badajoz, Mérida | |
| 3 | 2 | Compostela, Ourense | |
| 7 | 1 | Sporting | |
| 7 | 1 | Mallorca B | |
| 7 | 1 | Eibar | |
| 7 | 1 | Las Palmas | |
| 7 | 1 | Numancia | |
| 7 | La Rioja | 1 | Logroñés |
| 7 | 1 | Osasuna | |
| 7 | 1 | Hércules |