| Named By: | P. M. Galton in 2009 |
| Time Period: | Early Cretaceous, approximately 115 Ma |
| Location: | Niger - Elrhaz Formation |
| Size: | Femur 13.1 centimetres long |
| Diet: | Herbivore |
| Fossil(s): | Femur (upper leg/thigh bone). Humerus (upper arm bone) has also been assigned to the genus |
| Classification: | | Chordata | Reptilia | Dinosuria | Ornithischia | Ornithopoda | Iguanodontia | Dryosauroidea | Dryosauridae | |
| Also known as: | | Valdosaurus nigeriensis | |
Elrhazosaurus is a genus of basal iguanodontian dinosaur, known from isolated bones found in Lower Cretaceous rocks of Niger. These bones were initially thought to belong to a species of the related dryosaurid Valdosaurus, but have since been reclassified.