| Tourney Name: | A3 Champions Cup |
| Year: | 2003 |
| Other Titles: | A3 Mazda Cup 2003 |
| Country: | Japan |
| Dates: | 16 – 22 February |
| Confederations: | 1 |
| Num Teams: | 4 |
| Venues: | 1 |
| Cities: | 1 |
| Count: | 1 |
| Matches: | 6 |
| Goals: | 14 |
| Top Scorer: |  Hao Haidong (Dalian Shide, 3 goals) |
| Player: |  Yutaka Akita (Kashima Antlers) |
| Nextseason: | 2004 |
The 2003 A3 Champions Cup was first edition of A3 Champions Cup. It was held from February 16 to 22, 2003 in Tokyo, Japan.
Jubilo Iwata - 2002 J. League Champions Kashima Antlers - 2002 J. League Cup Winners
Seongnam Ilhwa Chunma - 2002 K-League Champions Dalian Shide - 2002 Chinese Jia-A League Champions| width=200 | Team | width=20 | width=20 | width=20 | width=20 | width=20 | width=20 | width=20 | width=20 | ||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Kashima Antlers | 3 | 2 | 1 | 0 | 5 | 1 | +4 | 7 | |||||||||
| Dalian Shide | 3 | 2 | 0 | 1 | 5 | 5 | 0 | 6 | |||||||||
| Seongnam Ilhwa Chunma | 3 | 1 | 1 | 1 | 4 | 3 | +1 | 4 | |||||||||
| Jubilo Iwata | 3 | 0 | 0 | 3 | 0 | 5 | −5 | 0 |
All times are Japan Standard Time (JST) – UTC+9--------------------
| width=30 abbr="Position" | Pos | Player | width=200 | Team | Goals |
|---|---|---|---|---|---|
| 1 | Hao Haidong | Dalian Shide | 3 | ||
| 2 | Shin Tae-Yong | Seongnam Ilhwa Chunma | 2 | ||
| 3 | Zoran Janković | Dalian Shide | 1 | ||
| Wang Sheng | Dalian Shide | ||||
| Yutaka Akita | Kashima Antlers | ||||
 Euller | Kashima Antlers | ||||
| Fernando | Kashima Antlers | ||||
| Mitsuo Ogasawara | Kashima Antlers | ||||
| Atsushi Yanagisawa | Kashima Antlers | ||||
 Saša Drakulić | Seongnam Ilhwa Chunma | ||||
| Kim Dae-Eui | Seongnam Ilhwa Chunma |