Neocollonia ponsonbyi is a species of sea snail, a marine gastropod mollusk in the family Colloniidae.

(Original description in Latin) The subglobose shell is thick and deeply umbilicate.

The base of the shell is convex, with a thick nodose rib in the umbilical region and is bordered by a deep and rather wide groove.

The operculum is flat on the inside, convex on the outside, deeply umbilicate, wrinkled, bordered by a somewhat narrow keel.

[2] This marine species occurs off Northeast Cape to Durban, South Africa