Fossarina picta is a species of very small sea snail, a marine gastropod mollusc or micromollusk in the family Trochidae, known as the top snails.

The shell is depressed and turbinate, bearing a strong resemblance to Fossarina patula, though its spiral lirae are uniform and straightforward.

The lips are sharp and arcuate, while the aperture takes on a near-circular shape.

Irregular purple-black radiating blotches are present on the shell, and the umbilical region typically displays a pale yellow hue.

[1] This marine species occurs off the coat of South Korea and Japan.