Greek rhetorician who was one of the most important critics and rhetoricians of the Augustan age. The Byzantine Suda lexicon says that he was Jewish.

Only fragments of Caecilius's works are extant, among which are On the Style of the Ten Orators; On the Sublime, which was attacked by the so-called Longinus in a more famous work of the same title; History of the Servile Wars, or slave risings in Sicily; an Alphabetical Selection of Phrases, an Attic lexicon, mentioned in the later Suda lexicon as one of its authorities; and Against the Phrygians, probably an attack on the florid style of the Asiatic school of rhetoric.