The gens Oclatinia was an obscure Roman family of imperial times. It is best known from a single individual, Marcus Oclatinius Adventus, consul for the second time^[i] in AD 218, together with the emperor Macrinus. From various sources, we know that he was procurator Augustorum under Septimius Severus in AD 202,^[1] and governor of Britain between 205 and 207.^[2][3][4]

The nomen Oclatinius clearly shares a root with Oclatius, borne by Tiberius Oclatius Severus, consul suffectus in AD 160, and is perhaps an orthographic variant of Ocratius, part of a class of gentilicia formed using the suffix -atius, derived from place-names ending in -as or -atis, or passive participles ending in -atus.^[5]

• List of Roman gentes

• Lucius Cassius Dio Cocceianus (Cassius Dio), Roman History.
• Herodianus, History of the Empire from the Death of Marcus.
• Theodor Mommsen et alii, Corpus Inscriptionum Latinarum (The Body of Latin Inscriptions, abbreviated CIL), Berlin-Brandenburgische Akademie der Wissenschaften (1853–present).
• George Davis Chase, "The Origin of Roman Praenomina", in Harvard Studies in Classical Philology, vol. VIII (1897).
• Paul von Rohden, Elimar Klebs, & Hermann Dessau, Prosopographia Imperii Romani (The Prosopography of the Roman Empire, abbreviated PIR), Berlin (1898).