Copper(II) perchlorate is an inorganic compound with the chemical formula Cu(ClO4)2(H2O)x.

The anhydrous solid is rarely encountered but several hydrates are known.

[3] Infrared spectroscopic studies of anhydrous copper(II) perchlorate provided some of the first evidence for the binding of perchlorate anion to a metal ion.

[4] The structure of this compound was eventually deduced by X-ray crystallography.

Copper resides in a distorted octahedral environment and the perchlorate ligands bridge between the Cu(II) centers.