| Named By: | Albert PrietoinMarquez, Luis Chiappe & Shantanu Joshi in 2012 |
| Time Period: | Late Cretaceous, 73.6-73 Ma |
| Location: | Baja California - El Gallo Formation |
| Size: | Estimated 12.5 meters long |
| Diet: | Herbivore |
| Fossil(s): | Partial post cranial and skull remains, as well as attributed skin impressions |
| Classification: | | Chordata | Reptilia | Dinosauria | Ornithischia | Ornithopoda | Hadrosauridae | Euhadrosauria | Lambeosaurinae | |
| Also known as: | | Lambeosaurus laticaudus | |
Magnapaulia is a genus of herbivorous lambeosaurine hadrosaurid dinosaurs known from the Latest Cretaceous Baja California, of northwestern Mexico. It contains a single species, Magnapaulia laticaudus. Magnapaulia was first described in 1981 as a possible species of Lambeosaurus by William J. Morris, and was given its own genus in 2012 by Prieto-Marquez and colleagues.