CS2Bio 2012, Proceedings of the third international workshop on Interaction between Computer Science and Biology Stockholm, Sweden, June 16, 2012, ENTCS 293 Paola Giannini and Erik de Vink (eds.) This ENTCS volume contains the post-proceedings of the third International Workshop on Interactions between Computer Science and Biology (CS2Bio'12) held in Stockholm on the 16th of June 2012. This workshop was organized as an a?liated event of the seventh International Federated Conferences on Distributed Computing Techniques (DisCoTec'12).