Kullebunden Idrætsklub was founded in 1915 with Normand Nilsen as its first chairman. The club later changed its name to Kolbotn Idrettsklubb (KIK).
Kolbotn Arbeideridrettslag (Kolbotn AIL) was founded in 1924.
In 1934, the speedskaters broke away from KIK and started Kolbotn Skøyteklubb with Wilhelm Berthelsen as chairman. In 1946, the three clubs Kolbotn Idrettsklubb, Kolbotn Arbeideridrettslag, and Kolbotn Skøyteklubb merged and took the new name Kolbotn Idrettslag (aka Kolbotn I.L.). In 1985, Hellerasten Volleyball Klubb was included in Kolbotn I.L.[citation needed]
In 1925, polar explorer Roald Amundsen was appointed honorable member of the club.
The club is well-known for its eminent wrestlers. Kolbotn wrestlers had a successful period in the 1940s and again in the early 1980s to the mid-1990s. The most notable results were two Olympic gold medals by Jon Rønningen.
Kolbotn I.L. started Handball in 1940, and the Handball section won the National league in 1983 and 1984.
Kolbotn Volleyball won the National league in 1984 (as Hellerasten), and 1986. In 1992, Kolbotn Volleyball won both the National league and the National championship.[citation needed]
Kolbotn's Women's Football team won the elite Toppserien league in 2002, 2005, and 2006 and the national Cup championship in 2007. In 2009, Dan Eggen, former Norwegian international player, joined as the team's chief trainer.
Wrestling
1947 Reidar Merli, 2nd place in European Championship
