The Danish League title started in 1913, so there was no winner in 1903.
Boldklubben 1903 (or B 1903) beat Frem.
Vejle beat Boldklubben 1903 (or B 1903).
Boldklubben 1903 (or B 1903) beat Boldklubben 1913 (or B 1913).
Boldklubben 1903 (or B 1903) beat Akademisk Boldklub Gladsaxe (or AB).
Boldklubben 1903 (or B 1903) beat Kjøbenhavns Boldklub (or KB).
Boldklubben 1903 (or B 1903) beat Nykøbing FC (B 1901).
Boldklubben af 1893 (or B 93) beat Boldklubben 1903 (or B 1903).
No winner was declared, because Boldklubben af 1893 (or B 93), Frem, and Boldklubben 1903 (or B 1903) all ended equal at 6 points. DBU proposed a rematch, but B 93 and Frem refused.
Hibernian were the winners of the Scottish Premier League in 1903.
The winners of the Belgian League in 1903 were Racing Club de Bruxelles.
The Italy League winners of 1903 were Genoa CFC Football Club.
HVV were the winner of the Eredivisie league in 1903.