The 2003 Southeastern Louisiana Lions football team represented Southeastern Louisiana University during the 2003 NCAA Division I-AA football season.

Led by first-year head coach Hal Mumme, the Lions compiled an overall record of 5–7.

Southeastern Louisiana played home games at Strawberry Stadium in Hammond, Louisiana.

This season marked the return of football at Southeastern Louisiana after a 17-year hiatus of play going back to their 1985 season.

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