| Named By: | William Daniel Conybeare & Henry De la Beche in 1821 |
| Time Period: | Late Triassic - Early Jurassic, Rhaetian-Pliensbachian |
| Location: | Europe including, Belgium, England, Germany and Switzerland |
| Size: | 2 meters long |
| Diet: | Piscivore |
| Fossil(s): | Many hundreds of specimens, some articulated. Skin impressions have also been recovered in some specimens. These reveal features such as the dorsal and caudal (tail) fins that are not often preserved |
| Classification: | | Chordata | Sauropsida | Ichthyosauria | Ichthyosauridae | |
Ichthyosaurus (derived from Greek ikhthus/ichthys meaning 'fish' and sauros/sauros meaning 'lizard') is a genus of ichthyosaurs from the late Triassic and early Jurassic (Rhaetian - Pliensbachian) of Europe (Belgium, England, Germany, Switzerland) and Asia (Indonesia). It is among the best known ichthyosaur genera, with the Order Ichthyosauria being named after it.