The Spanish giant overcame its Italian counterpart 3-1 in an absorbing contest that was settled by the last kick of the match, a sumptuous finish by Neymar.
Barcelona's fourth win in its last four Champions League finals gave it a fifth crown and the second treble in European club history.
Juventus, which now has lost four straight finals and a record six in all, will have to console itself with having reached an unexpected final in coach Massimiliano Allegri's first season and having run Barca close.
That is why the final in Berlin's Olympiastadion will go down as a win-win-win occasion for football, which desperately needed a lift after the murky revelations at administration level had rocked the world game to its foundations.
Barcelona completed a perfect season by adding the Champions League to the Primera Division and Copa del Rey titles.
Juve went home with the knowledge that it had gained its rightful place among the big guns of Europe.
And the game of football could pat itself on the back for providing a memorable finale to a fascinating Champions League season.
Lionel Messi, the world's finest footballer, will rarely play a better game without scoring.
The little master from Argentina was not at his lethal best but he ran the show with Andres Iniesta for most of the match, providing many attacking options for his team.
His movement and passing must have seemed like a blur to the Juve players.
Messi nearly brought the house down in the first half when he went on a mesmerising run at the Juve defence but lost control of the ball when he was about to play a cutback to Luis Suarez, who effectively decided the contest with a poacher's goal that put Barca 2-1 up after Juve had drawn level with another opportunist's strike from Alvaro Morata.
Barca had opened the scoring after four minutes through Ivan Rakitic, with a beautifully worked goal that set the tone for the rest of the half it generally controlled.
The Italian champion will rue its failure to take full advantage of its best moments midway into the second half when midfielders Andrea Pirlo, Claudio Marchisio and Paul Pogba began to dominate Barcelona, which suddenly had lost its composure and appeared unsettled if not rattled.
While its transition in the first half was slow and cumbersome, Juve became quicker and more direct in the second period.
However Luis Enrique's side gave Juve a taste of its own medicine by breaking quickly to score the goals that would seal the final and a deserved victory.
Needless to say, Messi was involved in all three goals.
He certainly will win FIFA's Ballon d'Or at the end of the year.
Juve's best player was veteran goalkeeper Gigi Buffon, which says it all really about Barcelona's tactical superiority.
In the first half he appeared to take on Barca on his own with a couple of superlative saves that underlined his status as one of the world's best shot stoppers.
How he managed to stop a point-blank shot from Dani Alves with an outstretched arm while diving the wrong way defied belief.
The man of the match was the magnificent Iniesta, who now has the rare distinction of having won man-of-the-match honours in a World Cup final (2010), European championship final (2012) and Champions League final (2015).
He now has four Champions League winner's medals too and the captain's armband full time from the departing Xavi - who made a cameo off the bench in his record setting 151st UCL game.
This splendid Barca team certainly is in good hands.
So is the game of football actually. The one played on the pitch, that is.
UEFA Champions League wins:10: Real Madrid
7: AC Milan
5: Barcelona, Bayern Munich, Liverpool
4: Ajax
3: Inter Milan, Manchester United
2: Benfica, Juventus, Nottingham Forest, Porto
1: Aston Villa, Borussia Dortmund, Celtic, Chelsea, Feyenoord, Hamburg, Olympique Marseille, PSV, Red Star, Steaua Bucharest.
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