2025–26 Danish 3rd Division

The 2025–26 Danish 3rd Division is the fourth season of the Danish 3rd Division since its establishment in 2021 as the new fourth tier in the Danish football league system. The season starts with a group of twelve teams. After 22 rounds, the group will be split into a promotion group and a relegation group. The top two teams of the promotion group will get promoted to the 2026–27 Danish 2nd Division. The bottom three of the relegation group will be relegated to the 2026–27 Denmark Series.

BK Frem and Nykøbing FC finished the 2024–25 season of the Danish 2nd Division in 11th and 12th place, respectively, and were relegated to the 3rd Division. They replaced Brabrand and VSK Aarhus, who were promoted to the 2025–26 Danish 2nd Division.

Vanløse IF, Vejgaard BK and Hørsholm-Usserød finished the 2024–25 season of the Denmark series as group winners (east and west) and play off winner, respectively, and were promoted to the 3rd Division. They replaced Holstebro, Avarta and Young Boys, who were relegated to the 2025–26 Denmark Series.

New for the season 2025-26 is the sponsor name CampoBet 3.division

On 9 Marts 2026, Holbæk B&I had 6 points deducted and got a fee of 100.000 dkk. due to a tax case.