The 1905 Prima Categoria season was won by Juventus.
Following the affiliation to the FIFA, the Italian Football Federation improved its championship with new regulations.
Home and away matches replaced the one-leg format.
The challenge round was abolished and a national final group was introduced.
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The results were decided after F.B.C. Torinese's forfeit.
Played on 12 February and 19 February|}
Played on 5 February and 19 February|}