Triphenylmethanethiol is an organosulfur compound with the formula (C<sub>6</sub>H<sub>5</sub>)<sub>3</sub>CSH. It is the thiol derivative of the bulky substituent triphenylmethyl (called trityl).
The compound forms a number of unusual derivatives that are more stable than less bulky analogues. The sulfenyl chloride (C<sub>6</sub>H<sub>5</sub>)<sub>3</sub>CSCl is obtained from the thiol with sulfuryl chloride. It in turn reacts with ammonia to form the sulfenamide (C<sub>6</sub>H<sub>5</sub>)<sub>3</sub>CSNH<sub>2</sub>. The thiol reacts with nitrous acid to give S-nitrosotriphenylmethanethiol (C<sub>6</sub>H<sub>5</sub>)<sub>3</sub>CSNO.