Methanedithiol is an organosulfur compound with the formula H<sub>2</sub>C(SH)<sub>2</sub>. A seldom used chemical, it forms when formaldehyde reacts with hydrogen sulfide under pressure:
This reaction competes with formation of trithiane:
Methanedithiol forms a solid dibenzoate derivative upon treatment with benzoic anhydride:
Methanetrithiol is also known.