Gibberula jayi is a species of sea snail, a marine gastropod mollusk, in the family Cystiscidae.
G. jayi is named in honor of John Clarkson Jay the discoverer of the genus.
The shell is around 2.6-2.7 mm long and 1.7 mm wide. The species has swollen shells at the posterior with a uniformly subhayline shell.
G. jayi occurs in the middle reef zone of Réunion due to being at a depth of 10 to 20 meters. The species is also possibly in Mauritius and Rodrigues