The Turin giants have two games left in Serie A but Allegri was due to miss them following a two-game suspension for his Cup final behaviour on Wednesday.
Allegri lost his cool in stoppage time when he grew angry at a decision, ripped off his jacket and earned a red card for sarcastically applauding the referee. Juventus ended up beating Atalanta 1-0.
Juventus said in a statement that Allegri's behaviour was not in line with the club's "values."
"The firing follows certain behaviour during and after the Italian Cup final that the club deemed incompatible with the values of Juventus, and the behaviour that those who represent it should have," the statement said.
Allegri paid the price for his angry antics at the Italian Cup final. (AP PHOTO)
Aside from the suspension, Allegri was also fined 5000 euros ($A8100) by the Serie A league judge.
Allegri "acted aggressively" and used insulting language and gestures towards the referee, the judge reported.
Allegri was also reportedly aggressive towards journalists after the match.
Away from the Italian Cup, Juventus have had a disappointing season, having fallen to fourth in Serie A and banned from European competition due to a false accounting case.
Allegri was in his second stint at Juventus, having rejoined the club in July 2021. He was more successful in his first term at the Bianconeri, winning five straight Serie A titles from 2015-19.
But his only trophy since returning was this week's Italian Cup win, which has now become his final match with the team.
Juventus did not immediately announce a replacement for Allegri. There has been speculation that the club wants to hire Thiago Motta from Bologna for next season, which may have led to a rift between Allegri and the club.
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