| Club: | Athletic Bilbao |
| Season: | 2020–21 |
| Chrtitle: | President |
| Chairman: | Aitor Elizegi |
| Mgrtitle: | Head coach |
| Manager: | Gaizka Garitano (until 3 January 2021)[1] Marcelino (from 4 January 2021)[2] |
| Stadium: | San Mamés |
| League: | La Liga |
| League Result: | 10th |
| Cup1: | Copa del Rey |
| Cup1 Result: | Runners-up |
| Cup2: | Supercopa de España |
| Cup2 Result: | Winners |
| League Topscorer: | Álex Berenguer (8) |
| Season Topscorer: | Raúl García (10) |
| Largest Win: | Athletic Bilbao 4–0 Real Betis Cádiz 0–4 Athletic Bilbao Athletic Bilbao 5–1 Getafe |
| Pattern La1: | _athletic2021h |
| Pattern B1: | _athletic2021h |
| Pattern Ra1: | _athletic2021h |
| Pattern So1: | _athletic2021h |
| Leftarm1: | FFFFFF |
| Body1: | FFFFFF |
| Rightarm1: | FFFFFF |
| Shorts1: | 000000 |
| Socks1: | 000000 |
| Pattern La2: | _athletic2021a |
| Pattern B2: | _athletic2021a |
| Pattern Ra2: | _athletic2021a |
| Pattern So2: | _athletic2021a |
| Leftarm2: | FFFFFF |
| Body2: | FFFFFF |
| Rightarm2: | FFFFFF |
| Shorts2: | BBBBCC |
| Socks2: | BBBBCC |
| Pattern La3: | _athletic1920a |
| Pattern B3: | _athletic1920a |
| Pattern Ra3: | _athletic1920a |
| Leftarm3: | FFFFFF |
| Body3: | FFFFFF |
| Rightarm3: | FFFFFF |
| Shorts3: | 227B32 |
| Socks3: | 227B32 |
| Prevseason: | 2019–20 |
| Nextseason: | 2021–22 |
The 2020–21 season was the 122nd season in the existence of Athletic Bilbao and the club's 90th consecutive season in the top flight of Spanish football. In addition to the domestic league, Athletic Bilbao participated in this season's editions of the Copa del Rey and the Supercopa de España. The season covered the period from 20 July 2020 to 30 June 2021, with the late start to the season due to the COVID-19 pandemic in Spain.
The season was the first since the 2011–12 without Aritz Aduriz, who retired in May 2020.
See main article: Athletic Bilbao B.
| Date | Player | From | Type | Fee | Ref | |
|---|---|---|---|---|---|---|
| 30 June 2020 | align=center colspan=2 | Loan return | [4] | |||
| 8 August 2020 | align=center colspan=2 | Loan return | [5] | |||
| 24 August 2020 | align=center colspan=2 | Loan return | [6] | |||
| 2 October 2020 | Transfer | €10.5M | [7] |
| Date | Player | To | Type | Fee | Ref |
|---|---|---|---|---|---|
| 20 May 2020 | Retired | [8] | |||
| 20 July 2020 | Unattached | align=center colspan=2 | End of contract | [9] | |
| 14 August 2020 | Transfer | Free | [10] | ||
| 1 September 2020 | Logroñés | Transfer | Free | [11] | |
| 21 September 2020 | Transfer | Free | [12] | ||
| 2 October 2020 | Transfer | Free | [13] | ||
| 28 January 2021 | align=center colspan=2 | Loan | [14] | ||
See main article: 2020–21 La Liga.
The league fixtures were announced on 31 August 2020.[15] [16]
See main article: 2020–21 Copa del Rey.
See main article: 2020–21 Supercopa de España.
The draw was held on 17 December 2020.[17] [18]
Last updated on 22 May 2021. Does not include the 2020 Copa del Rey Final, delayed until April 2021 and counted in the 2020–21 season in some resources – these stats are recorded under the 2019–20 Athletic Bilbao season article.|-! colspan=14 style=background:#dcdcdc; text-align:center|Goalkeepers|-! colspan=14 style=background:#dcdcdc; text-align:center|Defenders|-! colspan=14 style=background:#dcdcdc; text-align:center|Midfielders|-! colspan=14 style=background:#dcdcdc; text-align:center|Forwards|-! colspan=14 style=background:#dcdcdc; text-align:center|Players who have made an appearance this season but have left the club|}
| width=15 | width=15 | width=15 | width=15 | width=145 | Name | width=120 | La Liga | width=120 | Copa del Rey | width=150 | Supercopa de España | width=120 | Total | ||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 1 | 22 | MF |  | Raúl García | 5 | 3 | 2 | 10 | |||||||||
| 2 | 12 | FW | | Álex Berenguer | 8 | 1 | 0 | 9 | |||||||||
| 3 | 9 | FW | | Iñaki Williams | 6 | 1 | 1 | 8 | |||||||||
| 4 | 20 | FW | | Asier Villalibre | 4 | 1 | 1 | 6 | |||||||||
| 5 | 10 | FW | | Iker Muniain | 5 | 0 | 0 | 5 | |||||||||
| 6 | 8 | MF | | Unai López | 3 | 0 | 0 | 3 | |||||||||
| 7 | 2 | FW | | Jon Morcillo | 2 | 0 | 0 | 2 | |||||||||
| 3 | DF | | Unai Núñez | 1 | 1 | 0 | 2 | ||||||||||
| 4 | DF | | Iñigo Martínez | 1 | 1 | 0 | 2 | ||||||||||
| 16 | MF | | Oihan Sancet | 2 | 0 | 0 | 2 | ||||||||||
| 18 | DF | | Óscar de Marcos | 1 | 0 | 1 | 2 | ||||||||||
| 21 | DF | | Ander Capa | 2 | 0 | 0 | 2 | ||||||||||
| 13 | 5 | DF | | Yeray Álvarez | 1 | 0 | 0 | 1 | |||||||||
| 17 | DF | | Yuri Berchiche | 1 | 0 | 0 | 1 | ||||||||||
| 19 | FW |  | Kenan Kodro | 1 | 0 | 0 | 1 | ||||||||||
| Own goals | 3 | 0 | 0 | 3 | |||||||||||||
| Totals | 46 | 8 | 5 | 59 | |||||||||||||