Alloma is an extinct genus of sea sponge from the Emiratiidae. Fossils from this genus date to the Cretaceous (Albian-Cenomanian) of Folkestone, England (Copt Point?) and Charente-Maritime, France. Since it was never formally described in a peer-reviewed journal, the genus is considered a nomen nudum. The intended type species is "Alloma rhodani".
Fossil remains of this animal mostly include disarticulated spines, but complete specimens are known. Specimen size averages at around 16 millimetres (0.63 in) long at most.
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