| Named By: | Dal Sasso and Pinna in 1996 |
| Time Period: | Middle Triassic, 247.2-235.0 Ma[1] |
| Location: | Italy |
| Size: | Around 6 meters long |
| Diet: | Piscivore/Carnivore |
| Fossil(s): | Almost complete specimen that includes the remains of four embryos inside the body |
| Classification: | | Chordata | Reptilia | Ichthyopterygia | Ichthyosauria | Shastasauridae | |
Besanosaurus (meaning "Besano [Lombardy, N. Italy] lizard") is a genus of large ichthyosaur (a marine reptile, not a dinosaur) that lived during the middle Triassic period, approximately 235 million years ago. This marine reptile came from its own family Besanosauridae and was named by Dal Sasso and Pinna in 1996. The type of species is Besanosaurus leptorhynchus meaning "long-beaked reptile from Besano."