- Ángel Di María (18')
- Pablo Sarabia (36')
- Kylian Mbappé (68')
Nimes, who have lost nine of their last 11 games, have 15 points from 22 matches.
PSG were without the suspended Neymar but the Brazilian's absence was barely felt against a Nimes side who had little to offer.
Di Maria, who had not scored since last November, put the hosts ahead in the 18th minute after intercepting a poor backpass from Lamine Fomba.
Sarabia doubled the tally nine minutes from the break as he headed home from Di Maria's free kick.
Mbappe wrapped it up with a delightful curled shot after being set up by Leandro Paredes.