| Named By: | Louis Agassiz |
| Time Period: | Silurian-Devonian |
| Location: | Mostly Silurian deposits in Europe, especially the British Isles and Devonian deposits in North America. Some specimens have also been recovered from other parts of the world that have marine deposits dating back to these time periods |
| Size: | Body up to 1.6 meters long |
| Diet: | unavailable |
| Fossil(s): | Several specimens known |
| Classification: | | Arthropoda | Merostomata | Eurypterida | Pterygotioidea | Pterygotidae | |
Pterygotus is a genus of marine arthropod within the extinct order eurypterida (or Sea Scorpion), and includes some of the largest species of this group.