Benzeneselenol, also known as selenophenol, is the organoselenium compound with the chemical formula C6H5SeH, often abbreviated PhSeH.

This colourless, malodorous compound is a reagent in organic synthesis.

The diselenide can be converted back to the selenol by reduction followed by acidification of the resulting PhSe−.

Thus at neutral pH, it is mostly ionized: It is approximately seven times more acidic than the related thiophenol.

[1] Benzeneselenol was first reported in 1888 by the reaction of benzene with selenium tetrachloride (SeCl4) in the presence of aluminium trichloride (AlCl3).