Retymaijychampsa is an extinct genus of proterochampsid archosauriforms from the Mid–Late Triassic Santa Maria Formation (Paraná Basin) of Brazil.

This locality is part of the Pinheiros-Chiniquá Sequence of the Santa Maria Supersequence, representing the Dinodontosaurus Assemblage Zone.

[1] In 2025, Rodrigo T. Müller described Retymaijychampsa beckerorum as a new genus and species of CLADE proterochampsid archosauriforms based on these fossil remains.

The specific name, beckerorum, honors the Becker family, on whose property the type locality is located.

These results are displayed in the cladogram below:[1] Avemetatarsalia Pseudosuchia Litorosuchus Vancleavea Polymorphodon Jaxtasuchus Doswellia Rugarhynchos Stenoscelida Sphodrosaurus Retymaijychampsa Proterochampsa nodosa Proterochampsa barrionuevoi Cerritosaurus Tropidosuchus