Frigidoalvania brychia is a species of minute sea snail, a marine gastropod mollusc or micromollusc in the family Rissoidae.
The species has been reported from Saguenay Fjord and Gulf of Saint Lawrence in Canada as well as the Gulf of Maine in the North Atlantic Ocean.
The maximum recorded shell length is 5 mm.
Minimum recorded depth is 186 m. Maximum recorded depth is 2359 m.