This review article focuses on electrochemical impedance spectroscopic study of thiophenes on carbon materials, the importance of which has been realized by recent progress in literature. The review article has 3 separate sections. In the first part, most of the thiophene derivatives (thiophene, 3-methylthiphene, 3-hexylthiophene, 3,4-ethylenedioxythiophene, 3,4-propylenedioxythiophene, bithiophene, octylthiophene, 3-dodecylthiophene, 3-terthiophene, 3-phenylthiophene, 3-methoxythiophene) and copolymers of thiophenes have been reviewed. In the second part, carbon surfaces (carbon fiber microelectrode, glassy carbon, carbon nanotubes, etc.) were used as effective electrode materials. In the third part, the electrochemical impedance spectroscopy (EIS) of thiophenes was explained with supercapacitors and many different circuit modeling evaluations.