Tricolia is a genus of sea snails, marine gastropod molluscs in the subfamily Tricoliinae of the family Phasianellidae.

This genus consists of small species with a head without frontal lobes.

The radula has a broad, simple median tooth, overlying the bases of the inner laterals.

These are subrhomboidal, produced at their outer angles into wings which overlie the bases of the adjacent tooth outward, and have denticulate cusps.

The marginal teeth have long simple cusps, The columella is smooth, arcuate, and not dentate.