Athletik Sportklub, commonly referred to as Athletik SK or simply Athletik, was a Slovenian football club from Celje.

The club was founded in 1906 by the Germans of Celje.

[1] It was also referred to as Cillier Sportverein in the first part of the 1920 season.

Austrian striker Karl Dürschmied served as the club's player-coach in 1921 and accepted to play for the Ljubljana Football Subassociation in a friendly exhibition game against the France national team, which is often considered the first match of the Slovenia national team.

This article about a Slovenian football club is a stub.