Zachrysia trinitaria is a species of air-breathing land snail, a terrestrial pulmonate gastropod mollusc in the family Zachrysiidae.
This species is already established in the United States, and is considered to represent a potentially serious threat as a pest, an invasive species which could negatively affect agriculture, natural ecosystems, human health or commerce. Therefore it has been suggested that this species be given top national quarantine significance in the USA.