KKS 1925 Kalisz

The club has had a long history, majority of it spent in amateur or semi-professional divisions. The original club was founded in 1925 as Kaliski Klub Sportowy Kalisz.

In December 1948, a merger of 7 local clubs from the local textile industry created a new club, which was eventually renamed in February 1950 as Włókienniczy Związkowy Klub Sportowy Włókniarz Kalisz.

After the dissolution of the Eastern Bloc, a dire financial situation caused the club to be liquidated on the 6 March 1992, and many sections of the club ceased to exist. The football section of the club was reformed under the name Wistil in 1991, shortly before its official disbandment, and quickly returned to the name KKS Kalisz after disbandment of the original club.

With lack of on-field successes and failure to climb the league pyramid, the club withdrew half through the III liga in the 2002–03 season, officially disbanding in March 2003. The club reformed under the name KKS Prosna Kalisz but failed to field a senior team. The fans and management of the club decided to re-establish the club from scratch in 2006, starting from the bottom of the football pyramid, the 8th tier (klasa B), and earned promotion in their first season. In that decision, they also decided to establish a women's football team.

They reached the Polish Cup semi-finals in 2023, eliminating Ekstraklasa teams such as Widzew Łódź, Górnik Zabrze and Śląsk Wrocław, before losing to Legia Warsaw. In the 2023–24 season, KKS 1925 failed to secure promotion to the I liga despite finishing in a commendable third place, as they lost 1–2 to Stal Stalowa Wola in the play-off final.