Thiophene-3-acetic acid is an organosulfur compound with the formula HO2CCH2C4H3S.

It is a white solid.

It is one of two isomers of thiophene acetic acid, the other being thiophene-2-acetic acid.

Thiophene-3-acetic acid has attracted attention as a precursor to functionalized derivatives of polythiophene.

This article about an organic compound is a stub.