The 2021 Campeonato Paulista de Futebol Profissional da Primeira Divisão - Série A1 was the 120th season of São Paulo's top professional football league. The competition was played from 28 February to 23 May 2021.[1]
| Competition: | Campeonato Paulista - Série A1 |
| Season: | 2021 |
| Winners: | São Paulo |
| Relegated: | São Caetano &São Bento |
| Dates: | 28 February - 23 May 2021 |
| Num Teams: | 16 |
| Continentalcup2: | Série D |
| Continentalcup2 Qualifiers: | FerroviáriaSanto André Internacional de Limeira |
| League Topscorer: | Bruno Mezenga (9 goals) |
| Biggest Home Win: | Ferroviária 5–0 Botafogo |
| Biggest Away Win: | Inter de Limeira 0–4 São Paulo |
| Highest Scoring: | São Paulo 5–1 São Caetano (6 goals) |
| Matches: | 109 |
| Total Goals: | 249 |
| Longest Wins: | São Paulo (8 games) |
| Longest Unbeaten: | São Paulo (10 games) |
| Longest Winless: | São Caetano (All games) |
| Longest Losses: | Ituano (7 games) |
| Attendance: | 0 |
| Average Attendance: | 0 |
| Highest Attendance: | 0 |
| Lowest Attendance: | 0 |
| Prevseason: | 2020 |
| Nextseason: | 2022 |
In addition, it was also decided that Paulistão 2021 will have VAR in all games, including those in the first phase of the competition.[2]
The teams are ranked according to points (3 points for a win, 1 point for a draw, 0 points for a loss). If two or more teams are equal on points on completion of the group matches, the following criteria are applied to determine the rankings:
| Club | Home city | Manager | 2020 result | |
|---|---|---|---|---|
| São Paulo (Tatuapé) | ||||
| São Paulo (Perdizes) | ||||
| São Paulo (Morumbi) |
The Troféu do Interior of the 2021 Campeonato Paulista began on 12 May with the quarter-finals and ended on 20 May 2021 with the final. A total of six teams compete in the Troféu Interior.
| Round | Single match | |
|---|---|---|
| Quarter-finals | 12–13 May 2021 | |
| Semi-finals | 16–17 May 2021 | |
| Final | 20 May 2021 |
Note: The match was concluded the following day, due to a power outage at the stadium.----
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The knockout stage of the 2021 Campeonato Paulista began on 11 May with the quarter-finals and end on 23 May 2021 with the final. A total of eight teams compete in the knockout stage.
| Round | First leg | Second leg | |
|---|---|---|---|
| Quarter-finals | 11–14 May 2021 | – | |
| Semi-finals | 16 May 2021 | – | |
| Finals | 20 May 2021 | 23 May 2021 |
The quarter-finals will be played in a single match at the stadium of the better-ranked team in the first phase. If no goals were scored during the match, the tie will be decided via a penalty shoot-out. The semi-finals will be played with the same format as the quarter-finals.The finals will be played over two legs, with the team having the better record in matches from the previous stages hosting the second leg.
| Group | width=190 | Winners | width=190 | Runners-up |
|---|---|---|---|---|
| A | Corinthians | Internacional de Limeira | ||
| B | São Paulo | Ferroviária | ||
| C | Red Bull Bragantino | Palmeiras | ||
| D | Mirassol | Guarani | ||
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| Rank | Player | Club | Goals |
|---|---|---|---|
| 1 |  Bruno Mezenga | Ferroviária | 9 |
| 2 | Moisés | Ponte Preta | 6 |
| 3 | Jenison | Novorizontino | 4 |
| Pablo | São Paulo | ||
| 4 | Danielzinho | Novorizontino | 3 |
| Diego Tavares | São Bento | ||
| Gabriel Sara | São Paulo | ||
| Andrigo | Guarani |