The 2012–13 Topklasse season is the third edition of the Dutch third tier since its inauguration in the current form in 2010. A total 32 teams are participating in the league: 24 from the 2011–12 Topklasse, and the remaining eight from the 2011–12 Hoofdklasse. As usual, the competition is divided into two leagues: "Saturday" and "Sunday", who differ by the day their games are usually played.