Copenhagen Series for men (Danish: Københavnsserien for Herrer; Herre Københavnsserien[1]), unofficially also known as Københavnerserien and often shortened to KS serien and KS Herre, is the highest division for men organised by the regional football association DBU København (DBUK) and one of the sixth-highest divisions overall in the Danish football league system.
[2] With the formation of a regional association for the Copenhagen area in 1903, the administration of the league was handed over to the newly founded Københavns Boldspil-Union (KBU).
[3] At the time of the league's inception, it was the top flight of the Danish football league system featuring the best teams in the country, but it has since been moved to its current status as the sixth best level in Danish football, after a long period as the fifth best level, and now features lower ranking amateur clubs from the Copenhagen area and Bornholm including the reserve squads of clubs playing at the Danish third league tier or above.
[9] KBU's highest division, A-rækken, was renamed Mesterskabsrækken with the five biggest teams all owners of a football field (Kjøbenhavns Boldklub, Akademisk Boldklub, Boldklubben af 1893, Boldklubben Frem and Boldklubben 1903) under KBU as participants, while the name A-rækken was retained for KBU's second highest division, containing teams not owning a football field, and the third highest league became B-rækken, all tournaments consisting of a first, second and third team tournament.
[9] In 1936, KBU's highest division, Mesterskabsrækken, was dissolved as a result of the introduction to the double format to the nationwide leagues organized by the Danish Football Association (DBU), allowing KBU's previous second level league, A-rækken, to become the new highest division involving 16 first teams.
With the formation of Denmark Series, beginning with the 1966-season, reserve teams were now allowed to participate at the fourth level.