Diammonium tetrachloroplatinate is a chemical compound with the chemical formula (NH4)2[PtCl4].

[2][3] Diammonium tetrachloroplatinate can be synthesised by the reduction of ammonium hexachloroplatinate(IV) with ammonium oxalate: Diammonium tetrachloroplatinate forms odorless red crystals,[4] soluble in water, insoluble in ethanol.

[1][5] The crystals have a cubic structure with the space group P4/mmm (space group number 123).

Diammonium tetrachloroplatinate decomposes if heated: Diammonium tetrachloroplatinate was used in photography.

[6][7] Also used in spectral analysis standard and in the preparation of platinum sponge and platinum catalytic agent.