Crassispira guildingii is a species of sea snail, a marine gastropod mollusk in the family Pseudomelatomidae.
The length of the shell varies attains 8 mm.
The whorls are slightly concavely shouldered above, nodosely plicated beneath, transversely very closely striated. The color of the shell is very dark chocolate or blackish, interior same color.
This marine species occurs off St. Vincent (Antilles) and the West Indies.