Ammonium hexafluoroniobate is an inorganic chemical compound with the chemical formula NH4NbF6.

[1][2][3] Ammonium hexafluoroniobate forms white crystals of hexagonal system, space group R3m,[4] insoluble in water.

It causes eye, skin, and respiratory tract irritation.

[5] The compound is used as a solvent for organics.

[6]