| Club: | Rosenborg |
| Season: | 2003 |
| Manager: | Åge Hareide (until 27 November) Ola By Rise (from 28 November) |
| Stadium: | Lerkendal Stadion |
| League: | Tippeligaen |
| League Result: | 1st |
| Cup1: | Norwegian Cup |
| Cup1 Result: | Winners |
| Cup2: | UEFA Champions League |
| Cup2 Result: | Third qualifying round |
| Cup3: | UEFA Cup |
| Cup3 Result: | Third round |
| Prevseason: | 2002 |
| Nextseason: | 2004 |
The 2003 season was Rosenborg BK's 86th season in existence and the club's 24th consecutive season in the top flight of Norwegian football. In addition to the domestic league, Rosenborg BK participated in this season's editions of the Norwegian Football Cup, UEFA Champions League and the UEFA Cup.
Squad at end of season[1]
See main article: 2003 Tippeligaen.
See main article: 2003 Norwegian Football Cup.
See main article: article and 2003 Norwegian Football Cup final.
See main article: 2003–04 UEFA Champions League.
See main article: 2003–04 UEFA Cup.
Third round took place during the 2004 season.