| Named By: | Joseph Leidy in 1865 |
| Time Period: | Early Cretaceous, 112 Ma |
| Location: | USA, Maryland - Arundel Formation, Oklahoma - Antlers Formation |
| Size: | Estimated at about 15-18 meters long |
| Diet: | Herbivore |
| Fossil(s): | Partial remains |
| Classification: | | Chordata | Reptilia | Dinosauria | Saurischia | Sauropoda | Titanosauriformes | |
| Also known as: | | Pleurocoelus | |
Astrodon (aster: star, odon: tooth) is a genus of large herbivorous sauropod dinosaur, related to Brachiosaurus, that lived in what is now the eastern United States during the Early Cretaceous period. Its fossils have been found in the Arundel Formation, which has been dated through palynomorphs to the Albian about 112 million years ago. Adults are estimated to have been more than 9 m (30 ft) high and 15 to 18 m (50 to 60 ft) long.