Iridium disulfide is the binary inorganic compound with the formula IrS2.

Prepared by the direct reaction of the elements, the compound adopts the pyrite crystal structure at high pressure.

[1] At normal atmospheric pressures, an orthorhombic polymorph is observed.[2].

The high- and low-pressure forms both feature octahedral Ir centers, but the S–S distances are pressure dependent.

[3] Although not practical, IrS2 is a highly active catalyst for hydrodesulfurization.