Titanium(III) oxide is the inorganic compound with the formula Ti2O3.

A black semiconducting solid, it is prepared by reducing titanium dioxide with titanium metal at 1600 °C.

[3] At around 200 °C, there is a transition from semiconducting to metallic conducting.

[3] Titanium(III) oxide occurs naturally as the extremely rare mineral in the form of tistarite.

[4] Other titanium(III) oxides include LiTi2O4 and LiTiO2.