Pentacarbonylhydridorhenium is a chemical compound with the formula ReH(CO)5.

This colorless liquid is a weak acid and represents one of the most important derivatives of dirhenium decacarbonyl (Re2(CO)10).

It is synthesized by treating a methanolic solution of bromopentacarbonylrhenium(I) (Re(CO)5Br) with zinc and acetic acid (HOAc).

[1] It is moderately sensitive to light: samples turn yellow due to the formation of the metal cluster Re3H(CO)14 At 100 °C, it decomposes to Re2(CO)10:[1]