Lutetium(III) selenide is an inorganic compound with the chemical formula Lu2Se3.

Lutetium(III) selenide can be obtained by reacting lutetium and selenium: It can also be prepared by reacting lutetium oxide and hydrogen selenide at a high temperature:[2] Lutetium(III) selenide can form orthorhombic AgLuSe2 in the binary system of silver selenide.

[3] It can form Lu2PbSe4 and Lu2Pb4Se7 in the binary system of lead selenide.

[4]