Gallium perrhenate is an inorganic compound with the chemical formula of Ga(ReO4)3.

It exists in the anhydrous and hydrate forms.

Gallium can be anodically dissolved in perrhenic acid at 50-55 °C, and dried with sulfuric acid to obtain the hydrate crystal [Ga(H2O)6(ReO4)3]·2H2O.

[2] The anhydrous form can be obtained by reacting gallium(III) oxide and rhenium(VII) oxide at 450 °C.

[1] Gallium perrhenate decomposes above 300 °C to form rhenium(VII) oxide and gallium(III) oxide:[3]