氧化镉是镉的氧化物，分子式为CdO，可致癌。

氧化镉可溶于酸，生成 Cd[H₂O]₆；也可溶于碱，生成 [Cd(OH)₄]。

Cadmium oxide is an inorganic compound with the formula CdO. It is one of the main precursors to other cadmium compounds. It crystallizes in a cubic rocksalt lattice like sodium chloride, with octahedral cation and anion centers. It occurs naturally as the rare mineral monteponite. Cadmium oxide can be found as a colorless amorphous powder or as brown or red crystals. Cadmium oxide is an n-type semiconductor with a band gap of 2.18 eV (2.31 eV) at room temperature (298 K).