Spergo fusiformis is a species of sea snail, a marine gastropod mollusk in the family Raphitomidae.

The shell is fusiform, with a pointed apex and a smooth, glossy surface.

The coloration is typically a light brown or beige, often with darker spiral bands.

This species is adapted to cold, high-pressure environments of the deep sea and plays a role in the benthic ecosystem as a predator.

This marine species occurs off Madagascar, New Caledonia, China Sea and Japan