| Named By: | G. W. Storrs & P. S. Taylor in 1996 |
| Time Period: | Rhaetian - Hettangian |
| Location: | England - Lias Group - Blue Lias Formation, White Lias Formation |
| Size: | Around 1.5 to 2 meters long |
| Diet: | Piscivore/Carnivore |
| Fossil(s): | Several almost complete individuals |
| Classification: | | Chordata | Reptilia | Sauropterygia | Plesiosauria | Pliosauroidea | |
| Also known as: | | Plesiosaurus eleutheraxion | Plesiosaurus eleutheraxon | Plesiosaurus etheridgii | Plesiosaurus hexatarsostinus | Plesiosaurus pentatarsostinus | Plesiosaurus triatarsostinus | Plesiosaurus triotarsostinus | |
Thalassiodracon (tha-LAS-ee-o-DRAY-kon) is an extinct genus of small pliosaurs. The type and only species, is Thalassiodracon hawkinsi Owen 1840.