| Club: | AS Saint-Étienne |
| Season: | 2002–03 |
| Chrtitle: | President |
| Mgrtitle: | Head coach |
| Manager: | Frédéric Antonetti |
| Stadium: | Stade Geoffroy-Guichard |
| League: | Ligue 2 |
| League Result: | 9th |
| Cup1: | Coupe de France |
| Cup1 Result: | Seventh round |
| Cup2: | Coupe de la Ligue |
| Cup2 Result: | Quarter-finals |
| League Topscorer: | Patrice Carteron (8) |
| Season Topscorer: | Patrice Carteron Lilian Compan (9) |
| Average Attendance: | 14,934[1] |
| Largest Win: | Saint-Étienne 3–0 Istres Saint-Étienne 4–1 Amiens |
| Largest Loss: | Niort 3–0 Saint-Étienne Beauvais 3–0 Saint-Étienne Saint-Étienne 0–3 Gueugnon |
| Prevseason: | 2001–02 |
| Nextseason: | 2003–04 |
The 2002–03 AS Saint-Étienne season was the club's 70th season in existence and the second consecutive season in the second division of French football. In addition to the domestic league, Amiens participated in this season's edition of the Coupe de France and the Coupe de la Ligue. The season covered the period from 1 July 2002 to 30 June 2003.
See main article: 2002–03 Ligue 2.
See main article: 2002–03 Coupe de France.
See main article: 2002–03 Coupe de la Ligue.