Gold(I,III) chloride is the inorganic compound with the chemical formula Au4Cl8.

The compound, which is black, is photosensitive as well as air- and moisture-sensitive.

Single crystals of gold(I,III) chloride are triclinic with a P1 space group and consist of discrete Au4Cl8 molecules with idealised C2h symmetry.

[1] Within this the Au(I) centers are linearly coordinated with a Cl-Au-Cl bond angle of 175.0° (close to the ideal value of 180°) and an average bond length of 2.30 Å.

The Au(III) centers adopt a slightly irregular square-planar conformation with the Au-Cl bond lengths for bridging chlorides (2.33 Å) being slightly longer than those of terminal chlorides (2.24 Å).