| Club: | CD Castellón |
| Season: | 2020–21 |
| Ownertitle: | Owner |
| Chrtitle: | President |
| Chairman: | Vicente Montesinos |
| Mgrtitle: | Head coach |
| Manager: | Óscar Cano (until 11 January) Juan Carlos Garrido (from 12 January to 21 May) Sergi Escobar (from 22 May) |
| Stadium: | Nou Estadi Castàlia |
| League: | Segunda División |
| League Result: | 21st (relegated) |
| Cup1: | Copa del Rey |
| Cup1 Result: | Second round |
| League Topscorer: | Jamelli (7) |
| Season Topscorer: | Jamelli (7) |
| Pattern La1: | _castellon2021h |
| Pattern B1: | _castellon2021h |
| Pattern Ra1: | _castellon2021h |
| Pattern Sh1: | _freiburg1718a |
| Pattern So1: | _alaves1617a |
| Leftarm1: | FFFFFF |
| Body1: | FFFFFF |
| Rightarm1: | FFFFFF |
| Shorts1: | FFFFFF |
| Socks1: | FFFFFF |
| Pattern La2: | _castellon2021a |
| Pattern B2: | _castellon2021A |
| Pattern Ra2: | _castellon2021a |
| Pattern Sh2: | _castellon2021A |
| Pattern So2: | _castellon2021A |
| Leftarm2: | FFFFFF |
| Body2: | FFFFFF |
| Rightarm2: | FFFFFF |
| Shorts2: | FFFFFF |
| Socks2: | FFFFFF |
| Prevseason: | 2019–20 |
| Nextseason: | 2021–22 |
The 2020–21 Club Deportivo Castellón season was the club's 99th season in existence and the club's first season back in the second division of Spanish football, the Segunda División. In addition to the domestic league, Castellón participated in this season's edition of the Copa del Rey. The season covered the period from 26 July 2020 to 30 June 2021.
See main article: CD Castellón B.
| Date | Player | From | Type | Fee | Ref |
|---|
See main article: 2020–21 Segunda División.
The league fixtures were announced on 31 August 2020.[2] [3]
See main article: 2020–21 Copa del Rey.