The 84th season of the Campeonato Catarinense began on January 17, 2009, and ended on May 3, 2009.
Format
First stage
Teams are divided into a groups of ten teams.
One round-robin, in which all teams from one group play games against all teams within the group.
Second stage
Teams are divided into a groups of ten teams.
One round-robin, in which all teams from one group play games against all teams within the group.
Third stage
The group stage with four teams: the top 2 teams of each stage (with one bonus point) and the top 2 teams of two stages.
Two round-robin, in which all teams from one group play games against all teams within the group.
Four Stage:
Home-and-away playoffs with the top 2 teams of third stage.
The winner of the four stage was crowned the champion. The champions and the runner up qualified to Copa do Brasil 2010 and the champions qualified to Campeonato Brasileiro Série D 2009. The tree teams with the worst positions were released to Divisão Especial 2010.