We aim to provide the first report of microplastic presence (or absence) in deepwater corals. Deepwater corals aren’t as well-known as their tropical, shallow-water relatives, but their reef structure magnifies seafloor biodiversity by providing unique niches for thousands of species, including many potentially undiscovered ones. Microplastics, if deepwater corals consume them, may present a new threat to these ancient and understudied ecosystems.