The 2002–03 Argentine Primera B Nacional was the 17th season of second division professional of football in Argentina.
A total of 20 teams competed; the champion and runner-up were promoted to Argentine Primera División.
This leg was played between the Apertura and the Clausura winner, but as Atlético de Rafaela won both tournaments, was declared champion and was automatically promoted to 2003–04 Primera División, so the match was played between the best teams placed in the overall standings under Atlético de Rafaela; Argentinos Juniors and Quilmes.
Note: Quilmes won 1–0 on aggregate, promoting to Primera División.
The Promotion playoff loser (Argentinos Juniors) and the team placed 4th in the overall standings (San Martín (M)) played against the 18th and the 17th placed of the Relegation Table of 2002–03 Primera División.