The deal means BT Sport will have the rights to show up to 380 exclusively live matches a season until 2017/18.
Italian football fans can continue to enjoy watching clubs such as Roma and AC Milan attempting to wrestle the league title from current champions Juventus.
From August 2015, BT Sport will offer exclusively live midweek, top flight football action from the UEFA Champions League and UEFA Europa League.
Simon Green, head of BT Sport, said: “Serie A attracts some of the best players in the world and is a fantastic, competitive league featuring some of the legendary teams of European folklore, such as Juventus, AC Milan, Inter and Roma."
The deal follows yesterday's announcement that Sky Sports has won the rights to show Major League Soccer in a four-year deal.