| Club: | Athletic Bilbao |
| Season: | 2023–24 |
| Chrtitle: | President |
| Chairman: | Jon Uriarte |
| Mgrtitle: | Head coach |
| Manager: | Ernesto Valverde |
| Stadium: | San Mamés |
| League: | La Liga |
| League Result: | 5th |
| Cup1: | Copa del Rey |
| Cup1 Result: | Winners |
| League Topscorer: | Gorka Guruzeta (14) |
| Season Topscorer: | Gorka Guruzeta (16) |
| Average Attendance: | 46,112 |
| Pattern La1: | _athletic2324h |
| Pattern B1: | _athletic2324h |
| Pattern Ra1: | _athletic2324h |
| Pattern Sh1: | _white_stripes |
| Pattern So1: | _athletic2324h |
| Leftarm1: | FFFFFF |
| Body1: | FFFFFF |
| Rightarm1: | FFFFFF |
| Shorts1: | 000000 |
| Socks1: | 000000 |
| Pattern La2: | _athletic2324a |
| Pattern B2: | _athletic2324a |
| Pattern Ra2: | _athletic2324a |
| Pattern Sh2: | _athletic2324a |
| Pattern So2: | _athletic2324al |
| Pattern La3: | _athletic2324t |
| Pattern B3: | _athletic2324t |
| Pattern Ra3: | _athletic2324t |
| Pattern Sh3: | _red_stripes |
| Pattern So3: | _athletic2324t |
| Prevseason: | 2022–23 |
| Nextseason: | 2024–25 |
The 2023–24 season was Athletic Bilbao's 126th season in existence and 93rd consecutive season in La Liga. They also competed in the Copa del Rey, winning the latter title for the first time since 1984.
| Player | Transferred from | Fee | Date | Source | ||
|---|---|---|---|---|---|---|
| Mallorca | Free | [2] | ||||
| PEC Zwolle | Loan return | [3] | ||||
| Osasuna | €2million | [4] |
| Player | Transferred to | Fee | Date | Source | ||
|---|---|---|---|---|---|---|
| Udinese | Free | [5] | ||||
| End of contract | ||||||
| PEC Zwolle | Loan | [6] | ||||
| Racing Ferrol | Loan | [7] | ||||
| Position | Player | Until | Ref. | |
|---|---|---|---|---|
| MF | June 2032 | [8] | ||
| DF | June 2025 | [9] | ||
| DF | June 2024 | [10] | ||
| MF | June 2024 | [11] | ||
| MF | June 2026 | |||
| MF | June 2027 | [12] |
See main article: 2023–24 La Liga.
The league fixtures were unveiled on 22 June 2023.[13]
See main article: 2023–24 Copa del Rey.
Last updated on 6 April 2024.|-! 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|}