Mastersonia

{{Short description|Extinct genus of therapsids}}

{{Speciesbox

| name = Mastersonia

| fossil_range = {{fossilrange|279.5|268}}{{Cite web|url=https://paleobiodb.org/classic/checkTaxonInfo?taxon_no=38995|title = Fossilworks: Mastersonia}}

| genus = Mastersonia

| parent_authority = Olson, 1962

| species = driverensis

| authority = Olson, 1962

}}

Mastersonia is an extinct genus of non-mammalian therapsids from the Lower Permian of San Angelo Formation, Texas. It is only known from a few, very large vertebrae.{{Cite journal |last=Olson |first=Everett C. |date=1962 |title=Late Permian Terrestrial Vertebrates, U. S. A. and U. S. S. R. |journal=Transactions of the American Philosophical Society |volume=52 |issue=2 |pages=1-224}}