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A class of iridium hydrides, IrH_x (x=0.5, 1-4, 6), is calculated atab-initio level using the DFT. A number of hydrides are predicted to stabilizein the excess hydrogen environment and upon compression. The threshold pressurefor thermodynamical stabilization is calculated to ~5 and ~14 GPa at which,respectively, a trihydride (P6_3mc) and a dihydride (Ibam) stabilize withrespect to decomposition into pure element. The dihydride (Ibam) is calculatedto stabilize dynamically at P~14 GPa and the trihydride at P > 25 GPa. In boththe di- and trihydride iridium atoms form short directional contacts withhydrogens, typical for covalent bonds. The trihydride exhibit molecularcharacter and its relative stability is calculated to be higher than that ofthe dihydride, at least up to approx. 75 GPa.

High-pressure formation and stabilization of iridium hydrides