| Named By: | Ryosuke Motani in 1999 |
| Time Period: | Early Triassic |
| Location: | Spitsbergen |
| Size: | Unavailable |
| Diet: | Piscivore/Carnivore |
| Fossil(s): | Unavailable |
| Classification: | | Chordata | Reptilia | Ichthyopterygia | |
Isfjordosaurus is an extinct genus of ichthyopterygian marine reptile that lived during the Early Triassic. Fossils have been found on the island of Spitsbergen, part of the Svalbard archipelago off the northern coast of Norway. It was formally described by Ryosuke Motani in 1999 and contains the species Isfjordosaurus minor.