The 2002–03 Segunda División B season of began in August 2002 and ended in May 2003.
Playoffs de Ascenso: Relegated from Segunda División: Promoted from Tercera División: Relegated: Administrative relegation: Occupied the vacant spots by administrative relegations: Teams from Asturias, Canary Islands, Castile and León, Community of Madrid and Galicia.
Teams from Aragon, Basque Country, Cantabria, Castilla–La Mancha, La Rioja and Navarre
Teams from Balearic Islands, Castile and León, Catalonia and Valencian Community
Teams from Andalusia, Ceuta, Extremadura, Melilla and Region of Murcia