2017–18 Segunda División B
| Season | 2017–18 |
|---|---|
| Champions | Mallorca |
| Promoted | Mallorca Rayo Majadahonda Elche Extremadura |
| Relegated | Toledo Racing Ferrol Gimnástica Segoviana Cerceda Peña Sport Lealtad Osasuna B Caudal Llagostera Formentera Atlético Saguntino Peña Deportiva Deportivo Aragón Mérida Écija Córdoba B Betis Deportivo Lorca Deportiva |
| Biggest home win | Bilbao Athletic 8–0 Lealtad (28 April 2018) |
| Biggest away win | Lorca Deportiva 0–6 Córdoba B (29 October 2017) |
| Highest scoring | Real Unión 5–4 Gernika (22 April 2018) |
| Highest attendance | 22,457 Murcia 0–1 Elche (20 May 2018) |
← 2016–17 2018–19 → | |
The 2017–18 Segunda División B season was the 41st since its establishment. The first matches of the season were played on 20 August 2017, and the season ended June 2018 with the promotion play-off finals.