Triloculina is a genus of foraminifera in the order Miliolida, included in the Quinqueloculininae.
The test has three chambers, each a half coil in length.
The aperture is terminal, at the end of the final chamber, with a bifid tooth in adult forms.
As with the entire order, the test is composed of imperforate, porcelaneous calcite.
The Pliocene to Recent Cruciloculina is very similar, except for having a different aperture, and is a likely derivative.