Holmium(III) sulfide is the sulfide of holmium, with the chemical formula of Ho2S3.

Like other rare earth sulfides, it is used as a high-performance inorganic pigment.

[2] Holmium(III) sulfide can be obtained by the reaction of holmium(III) oxide and hydrogen sulfide at 1325 °C.

[3] Holmium(III) sulfide has orange-yellow crystals in the monoclinic crystal system,[1] with the space group P21/m (No.

[4] Under high pressure, holmium(III) sulfide can form in the cubic and orthorhombic crystal systems.