Pat Fitzgerald is not going down without a fight -- the fired Northwestern football coach just filed a wrongful termination lawsuit against the school ... and he's seeking at least $130 million.
48-year-old Fitzgerald was suspended and later booted from his alma mater amid allegations of hazing within the program back in July ... after an investigation determined the longtime coach did not know of any wrongdoing, but could have made an effort to find out about what was happening.
Fast forward to Thursday ... PF's attorneys are ripping the school's decision to fire their client after 17 seasons.