AS 23 Sofia

AS-23 was founded on 4 November 1923 following the merger of three Sofia-based football clubs: Officers' Sports Club, Athletic, and Slava. The club's first chairman was lieutenant colonel Nikola Karagyozov.

During 1930–31 season, the club won the local Sofia division. In the play-offs, AS-23 defeated Etar Veliko Tarnovo 5–0, Sila Yambol 7–0, Napredak Ruse 3–1 and won the final against Shipchenski Sokol 3–0. They managed to do a domestic double, winning the Bulgarian Cup the same year. In the 1940–41 season, some of the club's key players were drafted into the army and AS-23 finished 5th in the Sofia Elite Division. Nevertheless, they won the newly created tournament, the Tsar's Cup, by defeating Napredak Ruse 4–2 in the final. AS-23 experienced financial difficulties during the early 1940s, but the anti-communist Brannik organization provided financial help, while the Ministry of War procured the sports kits, allowing the club to survive. In November 1944, following the Soviet Army's occupation of Bulgaria, the club was merged with Shipka Sofia and Spartak Poduene to form Chavdar Sofia, which ultimately laid the foundations to what is known today as CSKA Sofia.

Bulgarian State Football Championship: Champions (1): 1931 Bulgarian Cup: Winners (1): 1941