Formation of national third-tier The decision to establish a nationwide third-tier league as part of the
Danmarksturneringen i fodbold below the second-tier
II Serie was made at the annual convention of the Danish FA (DBU), in 1936. The league started its operation in August 1936, when III Serie was created with two geographically divided constituencies, each including four teams playing two matches at home and away. Out of the eight teams, only one gained promotion to the second-tier the following season, following the promotion play-offs at the end of the season, which at the same time determined the overall league champions. With the
occupation of Denmark during World War II, the Danmarksturneringen's three league structure was disbanded in 1940.
Reintroduction of the third-tier 1945 In 1945, a Danish third level was reintroduced as the bufferzone between the elite teams and the amateur clubs with 10 teams. One team gained promotion to 2nd Division, and one relegated to the club's respective regional football league. In 1951, The 3rd Division was expanded to 12 teams and to teams was relegated to a newly created Kvalifikationsturneringen – the new buffer between the Danmarksturneringen and the regional football leagues. The structure was changed again in 1966. Two geographical groups with 12 teams each were created. Only one team could be promoted and two teams be relegated. The Danish 2nd Division West would for the most part consist of teams from the Jutland FA and Funen FA, while Danish 2nd Division East would consist of teams from the Zealand FA, Copenhagen FA, Lolland-Falster FA and Bornholm FA. In 1975, the number of teams in the league got expanded and the 3rd Division rolled into one row with 16 teams, where two teams could be promoted to the 2nd Division and teams relegated to the
Denmark Series. The Danish top-flight league was renamed in 1991, which included the second-tier being renamed to 1st Division and the third-tier becoming known as the 2nd Division. From 2005, the 2nd Division was changed to have 14 teams each in the East and West pools, with three teams to promote. In addition, access of up to eight reserve teams of the
Danish Superliga clubs was allowed in the 2nd Division. The number of teams in the 2nd Division was increased to 16 teams in 2008. In 2010, the reserve teams were removed from the 2nd Division following the foundation of the
Danish Reserve League. The 2nd Division did change again in 2015, that reduced the number of teams in the 2nd Division from 32 to 24. 3 pools with each 8 teams was created, where the four top finishers in each pool would be playing for promotion to the 1st Division, with promotion for the two best-placed teams. Also, there would be a relegation pool for the 12 teams that end up as 5–8 in one of their 3 pools, where the 9–12th places relegated to the Denmark Series. ==Sponsors and logos==