Calthalotia baudini is a species of sea snail, a marine gastropod mollusk in the family Trochidae, the top snails.

The rather thick, imperforate shell has a conic-elongate shape.

The 6 to 7 whorls are planulate, the first buff, eroded, the following whitish, ornamented with sparse rosy points and angular chestnut streaks.

The shell is spirally lirate, with about 8 lirae on the penultimate whorl.

The base of the shell is convex, with about 8 concentric lirae.