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Five works are attributed to him:
* {{polytoniclang|grc|Περὶ τῆς τοῦ Ἀνθρώπου Κατασκευῆς}}, ''De Corporis Humani Fabrica''. The longest of his works, and is an anatomical and physiological treatise in five books. It contains very little original matter, as it is almost entirely abridged from [[Galen]]'s great work, "''De Usu Partium Corporis Humani''," from which however Theophilus now and then differs, and which he sometimes appears to have misunderstood. In the fifth book he has inserted large extracts from [[Hippocrates]]' "''De Genitura''," and "''De Natura Pueri''." He recommends in several places the [[dissection]] of animals, but he does not appear ever to have examined a human body: in one passage he advises the student to dissect an [[ape]], or else a [[bear]], or, if neither of these animals can be procured, to take whatever he can get, "but by all means," he adds, "let him dissect something."<ref>Theophilus, ''De Corporis Humani Fabrica'', v. 11. §3.</ref>
* A treatise {{polytoniclang|grc|Περὶ Οὔρων}}, ''De Urinis'', which, in like manner, contains little or nothing that is original, but is a good compendium of what was known on the subject by the ancients, and was highly esteemed in the [[Middle Ages]], serving as a source of [[Gilles de Corbeil]]'s poem ''De Urinis''.
* A short treatise {{polytoniclang|grc|Περὶ Διαχωρημάτων}}, ''De Excrementis Alvinis''
* A Commentary on the "Aphorisms" of Hippocrates, which is sometimes attributed to a person named Philotheus.
* A short treatise {{polytoniclang|grc|Περὶ Σφυγμῶν}}, ''De Pulsibus''. It appears to be quite different from the work on the same subject by [[Philaretus]], which has been sometimes attributed to Theophilus. Also the source for a poem of Gilles de Corbeil.
==Notes==
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