The 2003–04 Argentine Torneo Argentino A[1] was the ninth season of third division professional football in Argentina.
A total of 20 teams competed; the champion was promoted to Primera B Nacional.
In every round the bye team played against the bye team of the other zone: Team from Zone A vs Team from Zone B and Team from Zone C vs Team from Zone D. In every round the bye team played against the bye team of the other zone: Team from Zone A vs Team from Zone B and Team from Zone C vs Team from Zone D.