| Club: | CA Osasuna |
| Season: | 2023–24 |
| Chrtitle: | President |
| Chairman: | Luis Sabalza |
| Mgrtitle: | Head coach |
| Manager: | Jagoba Arrasate |
| Stadium: | El Sadar |
| League: | La Liga |
| League Result: | 11th |
| Cup1: | Copa del Rey |
| Cup1 Result: | Round of 16 |
| Cup2: | Supercopa de España |
| Cup2 Result: | Semi-finals |
| Cup3: | UEFA Europa Conference League |
| Cup3 Result: | Play-off round |
| League Topscorer: | Ante Budimir (17) |
| Season Topscorer: | Ante Budimir (18) |
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| Prevseason: | 2022–23 |
| Nextseason: | 2024–25 |
The 2023–24 season was CA Osasuna's 104th season in existence and fifth consecutive season in La Liga. They also competed in the Copa del Rey, the Supercopa de España and the UEFA Europa Conference League.
See main article: CA Osasuna B.
| Player | Transferred from | Fee | Date | Source | ||
|---|---|---|---|---|---|---|
 Rayo Vallecano | Free | [2] | ||||
| Leganés | Free | [3] | ||||
| Villarreal | Loan | [4] | ||||
| Real Betis | €6,500,000 | [5] |
| Player | Transferred to | Fee | Date | Source | ||
|---|---|---|---|---|---|---|
| Andorra | Loan | [6] | ||||
| Mirandés | Loan | [7] | ||||
| Rayo Vallecano | Free | [8] | ||||
| Huesca | Loan | [9] | ||||
| Mallorca | Loan | [10] | ||||
| Real Betis | €4,000,000 | [11] |
See main article: 2023–24 La Liga.
The league fixtures were unveiled on 22 June 2023.[12]
See main article: 2023–24 Copa del Rey.
See main article: 2023–24 Supercopa de España.
See main article: 2023–24 UEFA Europa Conference League.
The draw for the play-off round was held on 7 August 2023.