Gibberula belizensis is a species of very small sea snail, a marine gastropod mollusc or micromollusc in the family Cystiscidae.
The shell of Gibberula belizensis reaches a length of 1.96 mm. The shell is glossy and translucent, giving it a delicate appearance.
This species occurs in the Caribbean Sea off Belize. It typically inhabits shallow marine environments with sandy or coral substrates, where it lives among small rocks and detritus.