The selection of contributions shows that there are many open research av- enues in ALife that involve complex networks, such as evolvability, artificial chemistries, social networks, game theory, genetic regulatory networks, and in- formation theory. We hope that the papers in this special issue will further motivate the cross-fertilization between the study of complex networks and AL- ife. We should like to thank all the reviewers for this special issue for their timely responses and useful comments: Chris Adami, Lee Altenberg, Alain Barrat, Randall Beer, Hugues Bersini, Johan Bollen, Markus Brede, Mikhail Burtsev, Alan Dorin, Nic Geard, Carlos Gershenson, Mario Giacobini, Juan Luis Jim´enez Laredo, Joseph Lizier, Michael Mayer, Juan Juli´ an Merelo Guerv´ os, Oliver Obst, Charles Ofria, Mahendrarajah Piraveenan, Mikhail Prokopenko, Tom Ray, Hi- roki Sayama, Hideaki Suzuki, Vito Trianni, Elio Tuci, Rosalind Wang, Borys Wrobel, and Larry Yaeger. We are also grateful for the support provided by the organizers of the ALife XII conference for facilitating the organization of the session on complex networks. We also appreciate the effort of all authors who submitted to the special issue and/or the ALife XII session. [1] Adami, C., Qian, J., Rupp, M., and Hintze, A. (2011) Information con- tent of colored motifs in complex networks. Artificial Life, special issue on Complex Networks , in press . [2] Bar-Yam, Y. (1997) Dynamics of Complex Systems . Studies in Nonlinear- ity, Westview Press. 5 References Acknowledgements