The goal-scoring striker is suffering from a muscle injury sustained during the Champions League quarter-final loss to Real Madrid
Montpellier, unbeaten at home since the opening day of the season, grabbed the lead on 41 minutes at the Stade de la Mosson when Daniel Congre's header was diverted into his own net by the hand of Argentine midfielder Leandro Paredes.
PSG had failed to win on any of their last three trips to Montpellier and were forced into a pair of early changes as Presnel Kimpembe and Idrissa Gueye hobbled off with injuries.
But the dismissal of Pedro Mendes on 72 minutes for a second yellow card after he scythed down Neymar proved the turning point.
The Brazilian dusted himself down and curled the resulting free-kick from 25 yards beyond Geronimo Rulli and into the top corner for his sixth goal this season to bring PSG level.
Neymar then slipped a ball through to Kylian Mbappe in the Montpellier area, the French forward cutting inside Arnaud Souquet and lashing inside the far post to put the visitors ahead.
Neymar almost netted again from a free-kick in a similar position when his effort struck the upright, before the world's two most expensive players combined to supply Mauro Icardi for the third goal in a seven-minute blitz.
Played into space down the left flank by Neymar, Mbappe clipped a delightful cross with the outside of his right boot for Icardi to volley home from eight yards.
There was concern in the closing stages when PSG goalkeeper Keylor Navas was struck on the head by a water bottle thrown from the stands.
The Costa Rican was tended to by the medical staff but finished the game as PSG put an end to Montpellier's six-match unbeaten run in the league.
Marseille have won five games on the bounce to emerge as the closest challenger to PSG. It is their best sequence since winning eight in a row in 2014 when Marcelo Bielsa was at the helm.
They will look to reduce the gap at the top back to five points on Sunday at home to fourth-placed Bordeaux, who put six past Nimes in midweek.
The goal-scoring striker is suffering from a muscle injury sustained during the Champions League quarter-final loss to Real Madrid
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