The 2006–07 Argentine Primera B Nacional was the 21st 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 Olimpo won both tournaments, was declared champion and was automatically promoted to 2007–08 Primera División, so the match was played between the best teams placed in the overall standings under Olimpo, San Martín (SJ) and Huracán.
It was played by the teams placed 4th, 5th 6th and 7th in the Overall Standings: Atlético de Rafaela (4th), Tigre (5th), Chacarita Juniors (6th) and Platense (7th).
The Promotion playoff loser (Huracán) and the Torneo Reducido winner (Tigre) played against the 18th and the 17th placed of the Relegation Table of 2006–07 Primera División.