Memmius Vitrasius Orfitus signo Honorius (died c. 369) was a Roman politician.
Orfitus came from a noble family, and started his career at a relatively young age.
He held the posts of quaestor and praetor before becoming consularis of Sicilia under Constantius II and Constans (340/350).
Because of that Orfitus was exiled and had his property confiscated, but soon he was recalled through the influence of Vulcacius Rufinus.
His wife, Constantia, was related to the house of Constantine; according to Alan Cameron, she probably was a daughter of Hannibalianus and Constantina.