Marginella aequinoctialis is a species of sea snail, a marine gastropod mollusk in the family Marginellidae, the margin snails.
This species has not, so far (2017) been formally reassigned to Glabella <small>Swainson, 1840</small> but belongs there as being a sibling species of Glabella bellii <small>(G.B. Sowerby II, 1846)</small>.
The length of the shell attains 10.9 mm.
This species occurs in the Atlantic Ocean off Gabon at a depth of 25 m.