| Named By: | P. Dantas, J. L. Sanz, C. M. Silva, F. Ortega, V. F. Santos & M. Cachao in 1998 |
| Time Period: | Late Jurassic 153-150 Ma |
| Location: | Portugal |
| Size: | Estimated to be about 17 meters long |
| Diet: | Herbivore |
| Fossil(s): | Several individuals, but usually represented only by partial remains |
| Classification: | | Chordata | Reptilia | Dinosauria | Saurischia | Sauropodomorpha | Sauropoda | Eusauropoda | |
| Also known as: | | Apatosaurus alenquerensis | Atlantosaurus alenquerensis | Camarasaurus alenquerensis | |
Lourinhasaurus (meaning "Lourinha lizard") was an herbivorous sauropod dinosaur genus dating from Late Jurassic strata of Estremadura, Portugal.