Rhodium(IV) oxide (or rhodium dioxide) is the chemical compound with the formula RhO2.

RhO2 is highly insoluble even in hot aqua regia.

[1] RhO2 has the tetragonal rutile structure.

[2] RhO2 has metallic resistivity with values <10−4 Ohm·cm.

It transforms in air to Rh2O3 at 850 °C and then to metal and oxygen at 1050 °C.