Pentaphenylantimony is an organoantimony compound containing five phenyl groups attached to one antimony atom.

The structure of pentaphenylantimony has been the subject of several studies, and a definite ground state remains uncertain.

In crystals of the solvate with cyclohexane or tetrahydrofuran, the compound adopts a trigonal bipyramid shape.

[3] Pentaphenylantimony reacts with a variety of protic reagents (hydrogen halides, carboxylic acids, methanol, etc).

Benzene is one product as well as a tetraphenylantimony(V) compound:[4] Halogens also cleave one Sb-phenyl bond: When heated, pentaphenylantimony forms triphenylstibine, biphenyl and p-quaterphenyl.