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Publius Consentius was a 5th-century Latin grammarian and the author of two treatises, which are perhaps the fragments of a complete grammar: Ars de duabus partibus orationis, nomine et verbo, on the noun and the verb, which was much used during the Carolingian period, and Ars de barbarismis et metaplasmis, on barbarisms and metaplasm. The latter refers to a third essay, De structurarum ratione, on the structure of sentences, which, if ever published, no longer exists. De barbarismis was discovered by Andreas Wilhelm Cramer in a Regensburg manuscript now at Munich, and it was published at Berlin by Philipp Karl Buttmann in 1817.
Consentius is believed to have lived at Constantinople in the middle of the fifth century, and may have been the poet Consentius, his son, or his grandson. The poet and his grandson were praised by Sidonius Apollinaris, but the son may be the best candidate for the grammarian. According to Johann Albert Fabricius, in some manuscripts the grammarian is styled not only vir clarissimus, the ordinary appellation of learned men at that period, but also quintus consularis quinque civitatem, indicating that he had achieved high office and imperial favor. Consentius the son rose to high honor under Valentinian III, who named him Comes Palatii and dispatched him upon an important mission to Theodosius II.