The Spaniard beat Austrian Dominic Thiem, who was making his first appearance in a Grand Slam final, in straight sets; 6-4, 6-3, 6-2.
Nadal got off to a dream start, pocketing the first six points of the match as he broke Thiem in the second game to open up a 2-0 lead.
This is Nadal's 17th grand slam title.
Some wishful anticipation had been made of the fact that, 30 days prior, Thiem had beaten Nadal on the clay of Madrid, but Thiem reminded everyone Friday that the clay of Madrid is not the clay of Paris. He dropped serve in the third and Nadal held for 3-1 after taking a time out because of a sore hand.
The trophy was carried into the Court Philippe Chatrier in a brown box during a brief ceremony before play begins and unveiled by the two stars of music and screen. The world No. 8, too, was the last man to overcome Nadal on clay, last month in Madrid. He saved two of a mere three break points.
That was swatted away with Nadal's double-handed backhand, though, and the second set duly went the way of the favourite.
Pink Floyd frontman Roger Waters and James Bond actress Lea Seydoux have unveiled the Musketeers Cup that will be won by either Rafael Nadal or Dominic Thiem in the French Open final. However, here past year in the semi-finals, Nadal destroyed Thiem, losing just seven games in a rout, but it is worth mentioning that Thiem triumphed in their last meeting in Madrid last month, in the quarter-finals.
Nadal then served out that game. He suffered one service break, in the third game of the match, which came as big news. Its neck-in-neck in the first game.
Nadal called it "not even a dream" to gather 11 titles in Paris, saying it was "impossible to think of something like this".
Nadal's win-loss record in Roland Garros finals, which is the best in a Grand Slam final among men in the Open Era, ahead of Sampras (7-0, Wimbledon), Djokovic (6-0, Australian Open) and Borg (6-0, French Open).