Plutonium(III) iodide is the iodide of plutonium with the chemical formula PuI3.

Plutonium(III) iodide can be formed by the reaction of plutonium and mercury(II) iodide:[3] It can also be produced by reacting plutonium and hydrogen iodide at 450 °C.

Even if there is only a small amount of oxygen and water in the reaction, the generated plutonium(III) iodide will immediately hydrolyze into plutonium iodide oxide.

[3] Plutonium(III) iodide is a green solid with a melting point of 777 °C.

It is orthorhombic (plutonium(III) bromide structure), space group Ccmm (No.