25 teams throughout the country participated on the first edition of the league in 1981.
The winner and the runner-up of the league get promoted to Segunda División.
Matchday squads in the Tercera División must include only players under the age of 23.
These are the teams participating in the Chilean Tercera División, season 2023: Official knock-out competition open to the clubs in the two lower divisions of the Chilean football league system, only played some seasons.
The winners gets bonification points for the league tournament.