The 2020 Segunda División B play-offs (Playoffs de Ascenso or Promoción de Ascenso) are the final play-offs for promotion from 2019–20 Segunda División B to the 2020–21 Segunda División. The four first placed teams in each one of the four qualify for the promotion play-offs. Due to the COVID-19 pandemic, the relegation play-off was cancelled. Play-offs were played on 18 and 19 July as single-legged matches at a neutral venue.