Step-wise reaction of CdO, Bi₂O₃, and Cd(NO₃)₂ ^·4H₂O leads to formation of a novel bismuth oxide nitrate, CdBiO₂NO₃, which completes the family of bismuthite-like M^IIBiO₂NO₃ oxide nitrates. The new compound is tetragonal, I4/mmm, a = 3.9486(1)Å c = 14.2235(2)Å; its crystal structure resembles those of PbBiO₂NO₃ and CaBiO₂NO₃, except for, probably, different positioning of the nitrate group. The compound is stable until ∼425 °C when it decomposes, in one step, into CdO and a mixture of Bi–Cd oxides. Cd-based analogs of isostructural PbLnO₂NO₃ (Ln – lanthanides) oxide nitrates are unlikely to exist. We discuss the similarities and differences in the structures of layered oxyhalides and oxynitrates of bismuth and rare-earths.