Ammonium triiodide (NH<sub>4</sub>I<sub>3</sub>) is the salt of the ammonium cation with the triiodide anion.
Sometimes the name ammonium triiodide is mistakenly used to refer to a different compound, nitrogen triiodide (NI<sub>3</sub>), or more precisely, the slightly more stable ammine, NI<sub>3</sub> ÷ NH<sub>3</sub>.