دوري الدرجة الثانية الإسباني
The 2004 Segunda División B play-offs (Playoffs de Ascenso or Promoción de Ascenso) were the final playoffs for promotion from 2003–04 Segunda División B to the 2004–05 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.