Goals from Robert Lewandowski, Alejandro Balde, and Jules Koundé saw the Blaugrana coast past their local rivals.
The title is the first since 2019 for the club and the first major trophy won under the guidance of club legend Xavi, who also led his side to the Supercopa de España earlier this season.
Barcelona have been in superb form all season, sitting top of the table since November and losing just three times in LaLiga all campaign, pulling away from Real Madrid with a 13-game unbeaten run that lasted from October until the end of February.
The backline has been integral to Barça’s success, with the Blaugrana on course to set a new LaLiga record for fewest goals conceded in a season. They have still just conceded 11 goals all campaign and, with four games left to play, are sure to beat the existing record of 18.