Goals from Jonathan David and the brilliant Burak Yilmaz proved enough to give Christoph Gaultier's side their first title in a decade and hold off the riches of PSG in the process.
Lille knew that all they had to do was match PSG's result, and despite Neymar missing a first-half penalty, an own goal and a Kylian Mbappe strike meant that the Parisiens held up their end of the bargain.
But there were no nerves for Lille as David got them off to a perfect start, before winning a spot-kick which was duly converted by Yilmaz. The partnership have now netted over 30 Ligue goals this season.
Since going down 2-1 to Nimes in March, they have won six and drawn two of their last eight fixtures to keep PSG at bay.
Lille's budget is thought to be just 1/4 of what PSG spend on salaries, but due to the covid crisis will face a real challenge to keep their league-winning squad together for a tilt at the Champions League.
A number of key names have already been linked with a move away from the club and their squad may look very different at the beginning of next season.