Vexillum adamsianum is a species of small sea snail, marine gastropod mollusk in the family Costellariidae, the ribbed miters.
The shell is small, between in length. The shell often appears in white with red-brown or purple-brown blotch. The Aperture (mollusc) is pink to purple inside.
This marine species was found of Hawaii, Tahiti and Mozambique.
The species is named after Mr. Andrew C. Adams from Aiea, Hawaii, to honor his contributions to the study.