| Named By: | Elizabeth A. Friedman Fowler & John R. Horner in 2015 |
| Time Period: | Late Cretaceous, 79 Ma |
| Location: | USA, Montana - Judith River Formation |
| Size: | Holotype Estimated at up to 9 meters long. Possibly slightly larger when fully grown |
| Diet: | Herbivore |
| Fossil(s): | Partial skull and post cranial remains |
| Classification: | | Chordata | Reptilia | Dinosauria | Ornithischia | Ornithopoda | Hadrosauroidea | Hadrosauridae | Saurolophinae | |
Probrachylophosaurus bergei is a species of large herbivorous brachylophosaurin hadrosaurid dinosaur known from the Late Cretaceous Campanian Judith River Formation, of Montana.
The significance of this particular hadrosaur taxon is that it is a transitional species between the genera Acristavus and Brachylophosaurus evolving from a crestless ancestor (the former genus) to its crested descendant (the latter genus) while changing the morphology of its nasal bones.