Seguenzia monocingulata is an extinct species of sea snail, a marine gastropod mollusk in the family Seguenziidae.

[2] It resembles Seguenzia formosa and has been regarded as a synonym of that (extant) species.

The white, imperforate shell has a high conoid shape.

The whorls have revolving ribs, of which the last has about four distant prominent ones, besides minor striae on the base.

[4] This species was originally described by Seguenza from Pliocene fossils found at Torrente Trapani, a locality of the city of Messina, Sicily.