The 2004–05 Serie A was the 103rd season of top-tier Italian football, the 73rd in a round-robin tournament. It was expanded to contain 20 clubs, which played 38 matches against each other, rather than the 34 matches in previous seasons. The Coppa Campioni d'Italia was presented to the winners on the pitch for the first time. The first two teams qualified directly to UEFA Champions League, teams ending in the third and fourth places had to play Champions League qualifications, teams ending in the fifth and sixth places qualified to UEFA Cup, while only the last three teams were to be relegated in Serie B, the Italiansecond division, following a regulations change. Juventus finished as champions, however they were later stripped of the title due to their involvement in the Calciopoli. Runners-up Milan were also implicated in the scandal, and as a result that season's title was not awarded to any club. Udinese qualified for the UEFA Champions League for the first time in its history. Palermo, in its first Serie A campaign in over 30 years, finished in sixth place, qualifying for the UEFA Cup for the first time in its history. Roma qualified for the UEFA Cup as the runners-up in the Coppa Italia because the cupwinner, Internazionale, had already qualified for the Champions League. Two teams, Brescia and Atalanta, were directly relegated to Serie B, while the third relegation place was to be decided among three teams, Fiorentina, Bologna and Parma; counting only the so-calledclassifica avulsa, that is the table composed solely by the six matches between the three teams, Bologna and Parma had fewer points, and played the relegation tiebreaker. The tiebreaker was won by Parma, defeated 0–1 at home but winning 0–2 away in the return match. This method of classifying teams on equal points totals was abolished for the 2005–06 season.
The table lists the positions of teams after each week of matches. In order to preserve chronological evolvements, any postponed matches are not included to the round at which they were originally scheduled, but added to the full round they were played immediately afterwards.