Chromium(III) oxide (or chromia) is an inorganic compound with the formula Cr₂O₃. It is one of the principal oxides of chromium and is used as a pigment. In nature, it occurs as the rare mineral eskolaite.

Cr₂O₃ has the corundum structure, consisting of a hexagonal close packed array of oxide anions with ²⁄₃ of the octahedral holes occupied by chromium. Similar to corundum, Cr₂O₃ is a hard, brittle material (Mohs hardness 8 to 8.5).^[3] It is antiferromagnetic up to 307 K, the Néel temperature.^[4][5] It is not readily attacked by acids.