| Named By: | Carvalho & Bertini in 1999 |
| Time Period: | Late Cretaceous~84.9.0 Ma |
| Location: | Brazil - Adamantina Formation |
| Size: | Unavailable |
| Diet: | Uncertain |
| Fossil(s): | Many individuals |
| Classification: | | Chordata | Reptilia | Crocodylomorpha | Notosuchia | Notosuchidae | |
Mariliasuchus ("Marilia crocodile") is an extinct genus of Late Cretaceous notosuchian mesoeucrocodylian found near Marilia, Brazil. The first bone remains were found and collected in 1995 by Brazilian paleontologist William Nava, in red rocks from the fossiliferous Adamantina Formation. Four years later, it was described as Mariliasuchus amarali, by Brazilian paleontologists Ismar de Souza Carvalho and Reinaldo J. Bertini.
Its type species M. amarali, in honour of Sergio Estanislaw do Amaral, Brazilian naturalist. A second species, M. robustus, was named in 2007.