Borsonia zelandica is an extinct species of sea snail, a marine gastropod mollusk in the family Borsoniidae.

[1] The spiral ornament consists of four wavy cords between the keel and the lower suture.

The suture is margined by a stout swelling.

There are 6 to 7 axials per whorl with wider interstices.

[2] This extinct marine species was endemic to New Zealand