French Montana Donating Million Dollar Gift from Diddy

French Montana has one million reasons to love working for Diddy ... he just got a humongous bonus check.

We're told French -- who is signed to Bad Boy Records -- was gifted a million dollar bonus from Diddy for a year's worth of hard work.

French tells us he's donating the whole damn thing to a charity in the south Bronx he just started to help schools and young kids.

Sure beats that gift card you got for your friend.