The 1905 Campeonato Paulista, organized by the LPF (Liga Paulista de Football), was the 4th season of São Paulo's top association football league. Paulistano won the title for the 1st time. No teams were relegated. Germânia's Hermann Friese was the top scorer with 14 goals.
The championship was disputed in a double-round robin system, with the team with the most points winning the title. The last-placed team would dispute a playoff to remain in the league.