Berkelium(IV) oxide, also known as berkelium dioxide, is a chemical compound with the formula BkO<sub>2</sub>. This compound slowly decays to californium(IV) oxide. It can be converted to berkelium(III) oxide by hydrogen reduction at 600 ðC.
Berkelium(IV) oxide is produced by burning berkelium metal in air at 1200 ðC. It can also be produced by reacting berkelium(III) oxide with oxygen at 600 ðC.