| Club: | Panathinaikos |
| Season: | 2002–03 |
| Manager: | Fernando Santos Sergio Markarián |
| Chairman: | Angelos Filippidis |
| Owner: | Giannis Vardinogiannis |
| Stdtitle: | Ground |
| Stadium: | Leoforos Alexandras Stadium |
| League: | Alpha Ethniki |
| League Result: | 2nd |
| Cup1: | Greek Cup |
| Cup1 Result: | Second round |
| Cup2: | UEFA Cup |
| Cup2 Result: | Quarter-finals |
| League Topscorer: | Nikos Liberopoulos (16) |
| Season Topscorer: | Nikos Liberopoulos (20) |
| Pattern La1: | _nig06h |
| Pattern B1: | _shoulder_stripes_white_stripes |
| Pattern Ra1: | _nig06h |
| Pattern Sh1: | _adidaswhite |
| Pattern So1: | _3_stripes_white |
| Leftarm1: | 008000 |
| Body1: | 008000 |
| Rightarm1: | 008000 |
| Shorts1: | 008000 |
| Socks1: | 008000 |
| Pattern La2: | _nig06a |
| Pattern B2: | _shoulder_stripes_white_shirt |
| Pattern Ra2: | _nig06a |
| Pattern Sh2: | _adidasonwhite |
| Pattern So2: | _color_3_stripes_on_white |
| Leftarm2: | 008000 |
| Body2: | 008000 |
| Rightarm2: | 008000 |
| Shorts2: | 008000 |
| Socks2: | 008000 |
| Prevseason: | 2001–02 |
| Nextseason: | 2003–04 |
In the 2002–03 season Panathinaikos played for 44th consecutive time in Greece's top division, Alpha Ethniki. They also competed in UEFA Cup and Greek Cup. Their season started with Sergio Markarián as team manager.
See main article: 2002–03 Alpha Ethniki.
See main article: 2002–03 Greek Football Cup.
See main article: 2002–03 UEFA Cup.
See main article: 2002–03 UEFA Cup first round.
See main article: 2002–03 UEFA Cup second round.