Patagosaurus
- Pronunciation: PAT-uh-go-SAWR-us
- Translation: Patagonian Lizard
- Order: Saurischia
- Suborder: Sauropodomorpha
- Infraorder: Sauropoda
- Family: Cetiosauridae
- Height: 24 feet (7.3 meters)
- Weight: Period
- Length: 50 feet (15.2 meters)
- Description: Herbivore, Quadrupedal
- Notes: Patagosaurus was a cetiosaurid about the same sizeand shape as Cetiosaurus, but more primitive. It was also more primitive than Haplocanthosaurus but more advanced than Amygdalodon. Patagosaurus is named for the area in Argentina where it was found.