Vexillum festum, common name the pleasant mitre, is a species of small sea snail, marine gastropod mollusk in the family Costellariidae, the ribbed miters.
(Original description) The shell is pyramidally ovate, longitudinally obtusely ribbed. The interstices between the ribs are transversely cancellated. The shell is ivory-white. The body whorl is encircled with a broad olive-ash belt, indistinctly dotted with white. The columella is four-plaited.
This marine species occurs off the Philippines.