Papyrus 33 (P33) is a fourth/fifth-century manuscript of the Acts of the Apostles, containing only a portion of the text. Along with Papyrus 58, it formed part of a codex that contained a version of the Greek New Testament in the Alexandrian text-type. This chapter explores the significance of Papyrus 33 for the study of early Christianity and the textual history of the New Testament, and provides insight into its physical characteristics and current location at the Austrian National Library in Vienna.