Serratifusus harasewychi is a species of sea snail, a marine gastropod mollusc in the family Austrosiphonidae.
This species is named to honor Jerry Harasewych from the National Museum of Natural History, Smithsonian Institution, for his contributions the knowledge of columbariform molluscs.
The length of the shell attains 35.3 mm.
This marine species occurs off New Caledonia (depth range: 502–516 m).