Quintus Fabius Postuminus was a Roman senator who was suffect consul in the nundinum of May to August 96 with (possibly surnamed Paetus) as his colleague. Because the last known member of the republican and Patrician family of the Fabii was Paullus Fabius Persicus who died in the reign of Claudius, it is likely that Postuminus is descended from one of the clientes or freedmen of that house. Ronald Syme notes that there are about 300 Fabii known in the Spanish provinces, as well as fifty in Gallia Narbonensis; so it is likely Postuminus' origins were in one of the Western provinces.