Calliotropis tiara is a species of sea snail, a marine gastropod mollusk in the family Eucyclidae.

But these on the later whorls break up into tubercles, between which on the different rows there is a slight irregular connexion by flattened ridges, which are oblique, interrupted, and on the base sinuous.

The colour of the shell is white, with a translucent layer of porcellanous glaze over brilliant pearly nacre.

The flattened apex is small, with the minute inflated 1¼ embryonic whorl rising a little exserted on one side.

There are seven whorls projecting out squarely below the suture, flattened in the middle, protuberant at the second row of tubercles, and slightly contracted above the carina.

The columellar lip on leaving the body, bends over very flatly so as to cover the umbilicus, after which it curves round to the left.