Chromium oxide may refer to:
Chromium(II) oxide, CrO
Chromium(III) oxide, Cr2O3
Chromium dioxide (chromium(IV) oxide), CrO2, which includes the hypothetical compound chromium(III) chromate
Chromium trioxide (chromium(VI) oxide), CrO3
Chromium(VI) oxide peroxide, CrO5
Mixed valence species, such as Cr8O21