1904 in Argentine football saw Belgrano Athletic winning the Argentine championship ending a run of four consecutive titles for Alumni. Estudiantes de Buenos Aires was promoted to Primera by the Association after the good campaigns made in lower divisions and the contribution made by the club to the practice of football.
Flores did not register to play the tournament after a poor performance in the last season.
The 1904 championship had a 6 team, league format, with each team playing the other twice.
- Champion: Barracas Athletic II
Argentina national team