| Club: | Real Sociedad |
| Season: | 2003–04 |
| Chrtitle: | President |
| Chairman: | Jokin Aperribay |
| Mgrtitle: | Head coach |
| Manager: | Raynald Denoueix |
| Stadium: | Anoeta Stadium |
| League: | La Liga |
| League Result: | 15th |
| Cup1: | Copa del Rey |
| Cup1 Result: | Quarter-finals |
| Cup2: | UEFA Champions League |
| Cup2 Result: | Round of 16 |
| League Topscorer: | Nihat Kahveci (14) |
| Season Topscorer: | Nihat Kahveci (14)[1] |
| Prevseason: | 2002–03 |
| Nextseason: | 2004–05 |
The 2003–04 season was the 95th season in the history of Real Sociedad and the club's 38th consecutive season in the top flight of Spanish football. In addition to the domestic league, Real Sociedad participated in this season's editions of the Copa del Rey and the UEFA Champions League.
See main article: 2003–04 La Liga.
See main article: 2003–04 Copa del Rey.
See main article: 2003–04 UEFA Champions League.
See main article: 2003–04 UEFA Champions League knockout stage.