The way the suspected vampires were buried lead researchers to believe the people who put them in the ground believed they were blood suckers.
The skeletons were found with their skull placed between their legs so if the monsters came back to life they would have a hard time finding their noggin.
Workers also say there were rocks on top of the heads making it even harder for the vampires to come back.
One of the lead Archaeologists, Jacek Pierzak, told Polish newspaper Dziennik Zachodni "it was one of the most common forms of burying vampires."
der Spiegel reports the graves were found in Gliwice, Poland near a set of gallows which may indicate those in the graves met their end in savage ways.
So far 43 graves have been found on the land being searched and the skeletons are being tested.
Researchers will attempt to find the cause of death, while historians pour over church files on executions from the era in a search for more information.