| Named By: | Patrick S. Druckenmiller, Joern H. Hurum, Espen M. Knutsen & Hans Arne Nakrem in 2012 |
| Time Period: | Late Jurassic, Tithonian |
| Location: | Norway, Spitsbergen - Agardhfjellet Formation, Slottsmoeya Member |
| Size: | Length of the preserved holotype is 4.6 meters long. Length of the complete animal in life estimated about 5 - 5.5 meters long |
| Diet: | Piscivore/Carnivore |
| Fossil(s): | Single individual including an almost complete articulated skull and post cranial skeleton, lacking part of the tail |
| Classification: | | Chordata | Reptilia | Ichthyosauria | Ophthalmosauridae | |
Cryopterygius (meaning 'frozen fin' in Greek) is an extinct genus of ophthalmosaurid ichthyosaurian known from the uppermost Jurassic of Central Spitsbergen, Norway. It is known from a single, but largely complete specimen from the Slottsmoya Member of the Agardhfjellet Formation (middle Volgian/late Tithonian, Late Jurassic). At 5.0-5.5 m total length, it is a large ichthyosaur. The type species is Cryopterygius kristiansenae Druckenmiller et al., 2012. A second species, C. kielanae, was found in the Kcynia Formation from the Late Jurassic of Poland.