| Named By: | Mateus in 1998 |
| Time Period: | Late Jurassic, 150 Ma |
| Location: | Portugal - Lourinha Formation |
| Size: | Around 4.5 meters long for the type specimen, later research has speculated that Lourinhanosaurus may have reached 8 meters long when fully grown |
| Diet: | Carnivore |
| Fossil(s): | Partial post cranial remains including vertebrae, limb and foot bones, ilia, pubis, and ischia. Gastroliths were also found with the type specimen. Additional remains including around 100 fossil eggs have been referred to the genus |
| Classification: | | Chordata | Reptilia | Dinosauria | Theropoda | Allosauroidea | Sinraptoridae | |
Lourinhanosaurus (meaning "Lourinha [Formation] lizard") was a carnivorous theropod dinosaur genus that lived during the Late Jurassic Period (Kimmeridgian/Tithonian). Its first remains were found at Peralta, near Lourinha, Portugal in 1982, but were not described until 1998, by Portuguese paleontologist Octavio Mateus.
Its type (and to date only) species is L. antunesi, in honour of Portuguese paleontologist Miguel Telles Antunes.