What is the 'posthuman'? Is becoming posthuman inevitable-something which will happen to us, or something we will do to ourselves? Why do some long for it, while others fearfully reject it? These questions underscore the fact that the posthuman is a name for the unknown future, and therefore, not a single idea but a jumble of competing visions - some of which may be exciting, some of which may be frightening, and which is which depends on who you are, and what you desire to be. This book aims to clarify current theological and philosophical dialogue on the posthuman by arguing that theologians must pay attention to which form of the posthuman they are engaging, and to demonstrate that a 'posthuman theology' is not only possible, but desirable, when the vision of the posthuman is one which coincides with a theological vision of the human.