| Named By: | George Gaylord Simpson in 1937 |
| Time Period: | Early Paleocene-Mid Miocene (Tiupampan-Laventan)~66-11.8 Ma |
| Location: | Argentina, Patagonia - Casamayor Formation, Sarmiento Formation |
| Size: | Roughly estimated between 2.2 and 3.1 meters in length |
| Diet: | Carnivore |
| Fossil(s): | Partial skull and post cranial remains of several individuals |
| Classification: | | Chordata | Reptilia | Crocodylomorpha | Notosuchia | Sebecosuchia | Sebecidae | |
Sebecus (meaning "Sebek" in Latin) is an extinct genus of sebecid crocodylomorph from the Paleocene (Tiupampan) to Middle Miocene (Laventan) of South America. Fossils have been found in among others Patagonia. Like other sebecosuchians, it was entirely terrestrial and carnivorous. The genus is currently represented by a single species, the type S. icaeorhinus. Several other species have been referred to Sebecus, but were later reclassified as their own genera.