|Named By:||Tamaki Sato in 2003|
|Time Period:||Late Cretaceous, Campanian|
|Location:||Canada, Saskatchewan - Bearpaw Formation|
|Size:||Estimated at 7 meters long. Possibly 9 meters long if it had a neck of proportionate length to some other elamosaurids. Skull is 26.8 centimetres long|
|Fossil(s):||Skull and partial articulated skeleton, possibly of a sub adult|
|Classification:||| Chordata | Reptilia | Sauropterygia | Plesiosauria | Elasmosauridae ||
Terminonatator (meaning "last swimmer") is a genus of elasmosaurid plesiosaur from the Late Cretaceous of Saskatchewan, Canada. It is known from a skull and partial skeleton from a young adult, found in the Campanian-age Bearpaw Formation near Notukeu Creek in Ponteix. Terminonatator is currently one of the youngest plesiosaurs from the Western Interior Seaway.