| Competition: | Campeonato Paulista - Série A1 |
| Season: | 2005 |
| Winners: | São Paulo (22nd title) |
| Relegated: | União Barbarense União São João Atlético Sorocaba Inter de Limeira |
| Matches: | 190 |
| Total Goals: | 609 |
| League Topscorer: | Finazzi (17 goals) |
| Prevseason: | 2004 |
| Nextseason: | 2006 |
The 2005 Campeonato Paulista de Futebol Profissional da Primeira Divisão - Série A1 was the 104th season of São Paulo's top professional football league. The competition began on 19 January and ended on 17 April.São Paulo became the champions for the 22nd time.[1]
| Club | Home city | 2004 result | |
|---|---|---|---|
| 12th | |||
| 15th | |||
| São Paulo (Tatuapé) | 16th | ||
| 17th | |||
| 1st (Série A2) | |||
| 14th | |||
| 10th | |||
| 18th | |||
| São Paulo (Perdizes) | 4th | ||
| 2nd | |||
| 7th | |||
| São Paulo (Pari) | 13th | ||
| 6th | |||
| 11th | |||
| 9th | |||
| 3rd | |||
| 1st | |||
| São Paulo (Morumbi) | 5th | ||
| 8th | |||
| 19th |
| Rank | Player | Team | Goals | |
|---|---|---|---|---|
| 1 |  Finazzi | América | 17 | |
| align=center rowspan=2 | 2 | Deivid | Santos | 12 |
| Diego Tardelli | São Paulo | 12 | ||
| 3 | Robinho | Santos | 11 | |
| align=center rowspan=4 | 4 | Rômulo | Ituano | 10 |
 Frontini | Marília | 10 | ||
| Sandro Gaúcho | Santo André | 10 | ||
| Borges | União São João | 10 | ||
| align=center rowspan=2 | 5 | Roger | Ponte Preta | 9 |
| Marcinho | São Caetano | 9 |
Source: [2]