The 1923 National Championship (Serbo-Croato-Slovenian: Državno prvenstvo 1923. / Државно првенство 1923.) held in the Kingdom of Serbs, Croats and Slovenes was the first nationwide domestic football competition. At this point there was no league championship in the modern sense as the competition was held in a single-legged cup format, with participating clubs qualifying via regional playoffs organised by the existing 6 regional football subfederations.

Bačka

Građanski

Hajduk

Ilirija

Jugoslavija

SAŠK

Locations of teams in 1923 Yugoslav First League

• JSD Bačka (Subotica Football Subassociation)
• Građanski Zagreb (Zagreb Football Subassociation)
• Hajduk Split (Split Football Subassociation)
• Ilirija Ljubljana (Ljubljana Football Subassociation)
• SK Jugoslavija Belgrade (Belgrade Football Subassociation)
• SAŠK Sarajevo (Sarajevo Football Subassociation)

Champions:

HŠK Građanski^[1] (coach: Arthur Gaskell)

• Dragutin Vrđuka
• Fritz Ferderber
• Miho Remec
• Jaroslav Schiffer
• Dragutin Vragović
• Rudolf Rupec
• Rudolf Hitrec
• Dragutin Babić
• Stjepan Pasinek
• Antun Pavleković
• Franjo Mantler
• Emil Perška
• Bela Šefer
• Stebl
• Gec

Final goalscoring position, number of goals, player/players and club.^[2]

• 1 - 4 goals - Dragan Jovanović (Jugoslavija)
• 2 - 3 goals - Jakupec (SAŠK)
• 3 - 2 goals - Franz Mantler, Dragutin Babić, Emil Perška (all Građanski Zagreb), Nedžad Sulejmanpašić and Dragutin Sieber (SAŠK)

• Yugoslav Cup
• Yugoslav League Championship
• Football Association of Yugoslavia