There is a growing concern both publicly and professionally surrounding the implementation of Information and Communication Technologies (ICT) and their social and ethical impact. As these technologies become increasingly pervasive and less visible to the user, there is a greater need for professionals to address the concerns in order to regain public trust and maximise the benefits that these technologies can bring. This chapter explores the ethical aspects of the world of pervasive computing and shows the need for an ethical perspective when considering the design and implementation of complex, integrated, multiple systems. We present the background to ethics and technology to give the foundation for our discussion, and refer to current research and ethical principles to provide the argument for ethical consideration. Finally, codes of professional conduct provide the standards, and endorsement, for professional responsibility.