Holmium(III) selenide is an inorganic compound with the chemical formula Ho2Se3.

Holmium(III) selenide can be obtained from the reaction of holmium and selenium (in the presence of iodine):[2] It can also be prepared by reacting holmium oxide and hydrogen selenide at high temperature.

[3] Holmium(III) selenide can form orthorhombic AgHoSe2 in the binary system of silver selenide.

[4]