Milan were found guilty of entertaining unsavory relations through manager Leonardo Meani, which led to the help of match officials in at least one game.
Some politicians had called for an amnesty in view of Italy's World Cup victory, but judges ignored their requests.
A total of 25 people, including club managers, soccer federation officials and referees, were indicted on charges of sporting fraud and unfair behavior.
Juventus was the only club to admit to unsportsmanlike behavior by contacting refereeing officials but denied all allegations of actual match-fixing.
Convicted clubs now have three days to appeal the verdict, with a final decision due before July 25, the day Italy must register its clubs to take part in European events at the ruling body UEFA.
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