Tungsten(IV) oxide is the chemical compound with the formula WO2.

[1] The rutile-like structure features distorted octahedral WO6 centers with alternate short W–W bonds (248 pm).

[1] Each tungsten center has the d2 configuration, which gives the material a high electrical conductivity.

An intermediate in this reaction is the partially reduced, mixed valence species W18O49.

Single crystals are obtained by chemical transport technique using iodine.