Neptunium nitride is a binary inorganic compound of neptunium and nitrogen with the chemical formula NpN.

[1][2] Neptunium nitride can be prepared by the reaction of freshly obtained neptunium hydride and ammonia:[3] The reaction of neptunium and nitrogen can also obtain neptunium nitride: Neptunium nitride forms black crystals in the cubic system with Fm3m space group.

[4][5] It is insoluble in water[6] and decomposes if heated.

[7] Neptunium nitride is used as a target material for plutonium-238 production.

[8] This inorganic compound–related article is a stub.