The veteran striker netted his fifth goal in his fifth outing for the Canadian club since arriving in late July in the 2-1 victory over Chicago Fire.
In the 39th minute, Chelsea legend Drogba managed to controversially wrestle free from the grasp of Fire defender Jeff Larentowicz to finish Nigel Reo-Coker's right-wing cross with a customary header to open the scoring for the Impact.
Chicago were able to level it up on 50 minutes through David Accam before the Ghanaian striker inexplicably missed when one-on-one with Impact gloveman Evan Bush.
It proved to be a very costly miss by Accam as Montreal swept into the lead in the 76th minute when Patrice Bernier played a neat through-ball for Andres Romero to slot home prior to Laurent Ciman's injury-time red card, which fortunately for the home team, did not affect the result.
Earlier, Drogba had forced a quality save from Jon Busch with a powerful 21st-minute header form Dilly Duka's dangerous cross as he helped guide Mauro Biello's side into sixth place on the Eastern Conference table.
Watch Drogba's goal below:
GOAL_ Didier Drogba powers a header into the back of the net - Montreal Impact - http://t.co/rSfL1d0Gaj via @dailymotionind
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