The 2002–03 BBL season was the 16th campaign in the history of the British Basketball League.
This season's BBL Trophy featured all 11 BBL teams plus one invited teams from the English Basketball League, the Teesside Mohawks to bring the total number of teams divided evenly.
The First round saw all 12 teams split into four regionalised groups with the top finishing team advancing to the semi-finals.
Northern Group 1 Southern Group 1
Northern Group 2 Southern Group 2