Borsonella bartschi is a species of sea snail, a marine gastropod mollusk in the family Borsoniidae.

[1] The solid shell is white, covered with a pale straw-colored periostracum.

The axial sculpture consists of (on the penultimate whorl about nine) nodular ribs, peripheral on the spire, becoming obsolete on the body whorl, beginning in front of the fasciole and obscure beyond the periphery.

The spiral sculpture consists of fine striae, visible only in occasional spots.

[2] This species occurs in the Pacific Ocean off Santa Barbara Island, California.