| Named By: | Eric Buffetaut in 2012 |
| Time Period: | Late Jurassic, 148-145.5 Ma |
| Location: | Tanzania - Tendaguru Formation, Upper Dinosaur Member |
| Size: | Unknown due to lack of fossil remains. Holotype tooth is 49 millimetres long |
| Diet: | Carnivore/Piscivore |
| Fossil(s): | Isolated teeth |
| Classification: | | Chordata | Reptilia | Dinosauria | Saurischia | Theropoda | Megalosauridae | Spinosauridae | Baryonychinae | |
| Also known as: | | Ceratosaurus stechowi | |
Ostafrikasaurus is a genus of spinosaurid theropod dinosaurs known from the Jurassic of Tendaguru, southeastern Tanzania. It contains a single species, Ostafrikasaurus crassiserratus.