Lithium nitride is an inorganic compound with the chemical formula Li3N.

Lithium nitride must be protected from moisture as it reacts violently with water to produce ammonia: Two other forms are known: Lithium nitride shows ionic conductivity for Li+, with a value of c. 2×10−4 Ω−1cm−1, and an (intracrystal) activation energy of c. 0.26 eV (c. 24 kJ/mol).

[4] Reacting lithium nitride with carbon dioxide results in amorphous carbon nitride (C3N4), a semiconductor, and lithium cyanamide (Li2CN2), a precursor to fertilizers, in an exothermic reaction.

[10] At higher temperatures it will react further to form ammonia and lithium hydride.

Lithium nitride has been investigated as a storage medium for hydrogen gas, as the reaction is reversible at 270 °C.