Turbo lajonkairii, common name the Lajonkairi's turban, is a species of sea snail, a marine gastropod mollusk in the family Turbinidae, the turban snails.

The body whorl is one and one-half armed with erect long stout tubular spines on the carinae, ten to twelve in number on the last whorl, usually tinged with green.

The columella is thickened below, deflexed, produced and somewhat channelled, excavated at the conspicuous umbilicus.

Its outer surface is convex, coarsely granose, and dark brown in the center, lighter and minutely granulate toward the edges.

[3] This species occurs in the Eastern Indian Ocean (Cocos (Keeling) Islands) and in the Western Pacific