Copper(I) hydroxide is the inorganic compound with the chemical formula of CuOH.

Specifically, the dissociation of Cu(OH)2− leading to CuOH is subject to an energy of 62 ± 3 kcal/mol.

[3] Without evidence for its existence, CuOH has been invoked as a catalyst in organic synthesis[5] Gaseous CuOH has been characterized spectroscopically using intracavity laser spectroscopy,[6] single vibronic level emission,[7] and microwave spectroscopic detection.

[3] Although simple CuOH compounds are fairly elusive or restricted to the gas-phase within spectrometers, some derivatives are well characterized.

Specifically cuprous hydroxides have been prepared using bulky NHC co-ligands.