Guemesia (named after Martín Miguel de Güemes, whose death bicentenary was in 2021) is a genus of abelisaurid dinosaur from the Late Cretaceous Los Blanquitos Formation of Salta Province, Argentina.

It was found in the Los Blanquitos Formation, in the Amblayo Valley of Salta Province, Argentina.

[1] Agnolín et al. place Guemesia as a derived abelisaurid within the clade Brachyrostra.

[1] Spectrovenator Rugops Viavenator Rahiolisaurus Arcovenator Rajasaurus Indosaurus Majungasaurus Skorpiovenator Niebla Llukalkan Ilokelesia Guemesia Ekrixinatosaurus Carnotaurus Aucasaurus Abelisaurus Guemesia is known from the Los Blanquitos Formation.

The controversial tetanuran theropod Unquillosaurus is also known from this formation,[2] as well as fossils of what may belong to a species of Titanosaurus.