Atys caribaeus, common names the Caribbean glassy-bubble, Sharp's paper-bubble, is a species of small tropical sea snail, a bubble snail, a marine opisthobranch gastropod mollusk in the family Haminoeidae, the haminoea bubble snails.
The length of the shell attains 11 mm.
(Original description in French) The shell is oval, oblong, and thin, with a fragile and smooth texture that tapers at both ends. It is adorned with a few transverse striae. The spire is totally involute, marked by a slight umbilical depression that is not perforated. The aperture is narrow and barely arched, widening slightly toward the front; the columella is somewhat separated by an umbilical depression.
Its color is a uniform white.
This species occurs off Florida, in the Caribbean Sea and off Brazil, Western Atlantic Ocean; found at depths up to 183 m.