Jeremy Menez scored the only goal of the game in the 53rd minute to clinch the victory and prompt wild celebrations in the PSG dressing room.
The league leaders were on the back foot though in the early going and dodged a big bullet just moments into the game when Nicolas Douchez made a fantastic save to deny Bafetimbi Gomis.
PSG fired a warning shot of its own minutes later as Zlatan Ibrahimovic unleashed a low drive that was cleared off the line by a Lyon defender.
The visitors had another chance to take the lead but Menez was unable to find the back of the net from close range.
It was a splendid start but soon both teams tightened up and the first half was devoid of any noteworthy scoring chances.
PSG then scored the goal it was desperately looking for when Menez found himself with acres of space and powered a shot past a helpless Anthony Lopes.
The capital city club was content to defend in numbers and had two excellent opportunities to kill the game off but Menez and Javier Pastore were wasteful in front of goal.
Still, PSG saw off Lyon’s threat to win the club’s third league title much to the delight of manager Carlo Ancelotti.
“I’m very pleased because we have worked hard this season,” he said. “We wrapped it up against a good team.
“We deserved it and it’s time to celebrate. I’m very happy to have won the title in France.”
Ancelotti might not be around to defend the Ligue 1 title as rumors are running rampant and wild that he will leave the club in the summer.
Nonetheless, he will be satisfied that PSG won the Ligue 1 title for the first time in 19 years under his guidance.