This book on network ethics offers 15 scholarly chapters from a variety of disciplines and fields of study, all aimed at exploring some important aspect of how networks develop, enact, and enforce ethical norms. The chapters are ordered according to the levels of analysis each deals with, ranging from the cognitive/intrapersonal to the systemic/societal. Taken together, these chapter provide a fresh look at how networks are changing the way business is done and the way we think about ethics. Earlier versions of some chapters in this book were presented at the Conference ''Network Ethics:The New Challenge in Business, ICT and Education,'' hosted by the Center for Ethics, Business and Economics of the School of Business and Economics of the Catholic University of Portugal, in collaboration with Carnegie Mellon University and the University of Northern Iowa. Previously Published in the Journal of Business Ethics, Volume 90 Supplement 4, 2009