3-Methylthiophene is an organosulfur compound with the formula CH3C4H3S.

It is a colorless, flammable liquid.

It can be produced by sulfidation of 2-methylsuccinate.

[1] Like its isomer 2-methylthiophene, its commercial synthesis involvess vapor-phase dehydrogenation of suitable precursors.

3-Methylthiophene is a precursor to the drug thenyldiamine and the pesticide morantel.