The Derde Klasse (Third Class) is the sixth tier of football in the Netherlands and the fourth tier of Dutch amateur football. The league is divided into 44 division, 20 played on Saturday and 24 on Sunday.

Each division consists of 12 teams. The champions are promoted to the Tweede Klasse, the teams finishing 11th and 12th are relegated to the Vierde Klasse. Each season is divided into a number of periods (Dutch: periodes). The winner of these periods qualify for promotion playoffs, provided they finish in the top nine overall in the season. The team finishing 10th in the final rankings play relegation playoffs.

[edit] Derde Klasse divisions