Calendario Segunda B - Play Offs Ascenso
Jornada 1
| 15 May 21 |  Burgos |
1 - 0 |  Calahorra |
758 |
| 15 May 21 |  Real |
2 - 1 |  FC Andorra |
449 |
| 15 May 21 |  Linares |
1 - 2 |  Amorebieta |
747 |
| 16 May 21 |  CD Badajoz |
2 - 0 |  Zamora CF |
2k |
| 16 May 21 |  UD Ibiza |
0 - 0 |  Castilla |
882 |
| 15 May 21 |  UD Sanse |
1 - 3 |  Algeciras |
906 |
| 16 May 21 |  UCAM Murcia |
2 - 2 |  Barça |
2k |
| 16 May 21 |  Bilbao Ath. |
2 - 1 |  Celta |
455 |
Jornada 2
| 22 May 21 | Real |
2 - 1 | Algeciras |
1k |
| 22 May 21 | CD Badajoz |
0 - 1 | Amorebieta |
3k |
| 23 May 21 | Burgos |
1 - 0 | Bilbao Ath. |
1k |
| 23 May 21 | UD Ibiza |
1 - 0 | UCAM Murcia |
925 |
Burgos
Algeciras CF
Zamora CF
Barça Atlètic
CD Calahorra
RM Castilla
Bilbao Ath.
Real Sociedad B
Celta Fortuna
SD Amorebieta
UD Sanse
FC Andorra
UCAM Murcia
Linares Deportivo
UD Ibiza
CD Badajoz