Lajasvenator (meaning "Las Lajas hunter" after the city of Las Lajas in Neuquén, Argentina) is a genus of carcharodontosaurid dinosaur from the Mulichinco Formation from Neuquén Province in Argentina.

It is possible that the early evolutionary stage for the Carcharodontosauridae started with medium-sized predators like Lajasvenator that later diversified into the heavily-built taxa such as Giganotosaurus and Mapusaurus.

Lajasvenator is the oldest carcharodontosaur known from the Cretaceous of South America and is a key taxon for understanding the clade's evolutionary history.

[1] In their 2020 description of Lajasvenator, Coria et al. found it to be a carcharodontosaurid in a clade with Eocarcharia and Concavenator.

[1] In their description of Meraxes, Canale et al. (2022) recovered similar relationships, with Lajasvenator in a polytomy with Lusovenator, Eocarcharia, and Concavenator.