Theriosuchus is an extinct genus of atoposaurid neosuchian from Late Jurassic to Early Cretaceous of Europe (Hungary & southern England), Southeast Asia (Thailand) and western North America (Wyoming), with fragmentary records from Middle Jurassic and Early Cretaceous sites in China, Morocco, and Scotland.

[2] Three valid species are currently recognized: Theriosuchus pusillus from southern England,[3] T. grandinaris from Thailand,[4] and T. morrisonensis from the Morrison Formation of North America.

[5] Theriosuchus was previously assigned to Atoposauridae, but a 2016 cladistic analysis recovered it as a neosuchian more closely related to members of the family Paralligatoridae than to atoposaurids.

[2] Two species previously assigned to this genus, Theriosuchus ibericus[6] and T. symplesiodon,[7] have been reassigned to the new genus Sabresuchus.

[2] On the other hand, Theriosuchus guimarotae from Portugal[8] has been reassigned to Knoetschkesuchus.