This doctoral thesis is an editio princeps with transcriptions, translations and commentaries of twenty-two previously unedited papyrus Greek texts from Oxyrhynchus in Middle Egypt, all edited or assigned to the Roman Period, namely from the first century B. C. to the fourth A. D. It offers a balanced mixture of assorted Literary, Subliterary texts and Documents. Specifically, on the literary side, Homer and Demosthenes, the most popular authors in Egypt, are represented with one and five pieces respectively. All these texts are interesting with respect to the textual tradition of these particular authors. The rest of the literary and subliterary pieces are `new texts', including Scholia Minora to Iliad 1, Commentary on Odyssey 3, a fragment of the lost author Dictys Cretensis, historical and oratorical prose, and two very short fragments. An eclectic collection of nine documents is edited in the second part of the thesis: five official, namely two declarations of sheep and a census-return of early date, a petition and an order to summons, and four private documents, that is an acknowledgement of indebtedness, a sale of land, and two letters. All these documents are of interest, since they provide information regarding economy, admimistration, legal system, prosopography, literacy, language and other aspects of a hellenised provincial society under Roman rule.