| 2003 Detroit Lions season | |
|---|---|
| Owner | William Clay Ford Sr. |
| General manager | Matt Millen |
| Head coach | Steve Mariucci |
| Home field | Ford Field |
| Results | |
| Record | 5–11 |
| Division place | 4th NFC North |
| Playoff finish | Did not qualify |
| Pro Bowlers | CB Dré Bly |
| AP All-Pros | CB Dré Bly (2nd team) |
| Uniform | |
 | |
The 2003 season was the Detroit Lions' 74th season in the National Football League (NFL), their 70th as the Detroit Lions, and their first under head coach Steve Mariucci. The team improved upon their 3–13 record from the previous season but missed the postseason for the fourth consecutive season and finished last in their division for the third straight season.
The Lions selected Charles Rogers with the second overall selection in the 2003 NFL draft and brought in a number of defensive free agents, including cornerback Dré Bly on a five-year deal. However, injuries to the defense would hinder the Lions as they finished with the 25th ranked defense in points allowed. The offense didn't fare any better as they finished 26th in points scored. The run game finished 32nd in yards while the pass game finished 24th in yards. The Lions failed to win more than 5 games for the 3rd consecutive season.