Campeonato Paulista Série A3 (also referred to as Paulistão A3 for short) is the third level of the São Paulo state professional football championship, one of the Brazilian state championships. The tournament has been known as Série A3 since the 1993–94 season.

Structure

The current format of the Paulistão A3 was introduced in 2018, after the number of teams was decreased from 20 to 16. Two teams are promoted to Série A2, and the bottom two teams are relegated to Campeonato Paulista Segunda Divisão.

First stage

Each of the 16 competitors play each other once in the first stage of the competition, for a total of 15 matches between mid-January and early-April. A win earns three points and a draw earns one point. Teams are ranked by total points, then by total wins and finally by goal difference, number of scored goals, lower number of yellow and red cards taken. If teams are still level, a random draw is made to determine the final order in the standings. The 15th and 16th-placed teams are relegated to the state league fourth division.

Knockout phase

The top 8 teams from the first stage qualify for the knockout phase. The knock-out ties are played in a two-legged format. The eight teams are seeded 1 to 8 according to their first stage table positions, The top seed team plays the eight-seeded, the second plays the seventh, the third plays the sixth and the fourth plays the fifth. The winning teams are then reseeded, taking into account their quarterfinals results. In the semifinals, the highest-seeded team plays the lowest, and the other two winners from the previous round play each other. The winners of those contests win promotion to the Campeonato Paulista Série A2 and go on to face one another in the finals, which are also played in a two-legged format.

Clubs

2025 Série A3

List of champions

There are all the championship editions, officially recognized by Federação Paulista de Futebol. Amateur Era (1919-1947) Professional Era (1954-)

Titles by club

Teams in bold stills active.

Titles by city

Teams promoted from Série A3

Relegated teams

São Bento were saved from relegation due to the withdrawal of Novorizontino in the 2nd level. No teams were relegated due to the 2002 Torneio Rio-São Paulo.

Top scorers