Herein we have reported preparation of polythiophene (PTh)/graphene (GR) composite by interfacial polymerization and its use as a counter electrode (CE) for dye-sensitized solar cells (DSSCs). The composite electrode showed excellent catalytic activity for reduction of triiodide. Both the short-circuit photocurrent density and fill factor values of the composite increased on incorporation of GR sheets. The PTh/GR composite CE based DSSCs showed an energy conversion efficiency of 4.8% which is comparable to that of conventional Pt electrode. Thus PTh/GR composite material has proven to be an effective substitute to the expensive Pt electrode for application as next generation counter electrode in DSSCs. (C) 2015 Published by Elsevier Ltd.