Vanadium(III) oxide is the inorganic compound with the formula V2O3.

It is a black solid prepared by reduction of V2O5 with hydrogen or carbon monoxide.

[3][4] It is a basic oxide dissolving in acids to give solutions of vanadium (III) complexes.

[4] It is antiferromagnetic with a critical temperature of 160 K, below which there is an abrupt change in conductivity from metallic to insulating.

[5] This also distorts the crystal structure to a monoclinic space group: C2/c.