Tiarajudens (tee-AIR-ə-JOO-dens) ("Tiaraju tooth") is an extinct genus of saber-toothed herbivorous anomodonts which lived during the Middle Permian period (Capitanian stage) in what is now Rio Grande do Sul, Brazil.

It was named by Juan Carlos Cisneros, Fernando Abdala, Bruce S. Rubidge, Paula Camboim Dentzien-Dias, and Ana de Oliveira Bueno.

The degree of erosion and the color of the rocks were an indication of the locality's age and likelihood of preserving fossils.

[6] Cladogram after Cisneros et al., 2011:[1] Tetraceratops Raranimus Lycosuchus Biarmosuchus Gorgonops Herpetoskylax Estemmenosuchus Tapinocaninus Titanophoneus Syodon Biseridens Tiarajudens Anomocephalus Galechirus Otsheria Suminia Ulemica Patranomodon Galeops Eodicynodon Diictodon Robertia The saber-like teeth of Tiarajudens are unique among anomodonts, a group of entirely herbivorous therapsids.

[4][7] The teeth are even larger than those of the carnivorous therapsid Inostrancevia, one of the largest members of Gorgonopsia, a group characterized by the presence of long canines.