Arsenius (Latinized form) and Arsenios (Greek form) is a male first name. It is derived from the Greek word arsenikos (ἀρσενικός), meaning "male" or "virile". The name is especially prevalent among followers of Eastern Orthodox Christianity, as it is the name of several saints. Arsenius' name day is May 8 in Greece.
It may refer to:
Saint Arsenius the Great (c.350 – 445), also known as Arsenius the Deacon, Arsenius of Scetis and Turah, and Arsenius the Roman
Saint Arsenius of Corfu, first bishop of Corfu, (died c.959) one of the principal patron saints of Corfu