Deferrisoma is a genus of bacteria from the phylum Thermodesulfobacteriota. It is the only described member of the family Deferrisomataceae, order Deferrisomatales, and class Deferrisomatia. Known Deferrisoma species are thermophilic iron reducers that live on deep-sea and shallow hydrothermal vents.

The currently accepted taxonomy is based on the List of Prokaryotic names with Standing in Nomenclature (LPSN) and National Center for Biotechnology Information (NCBI).