Nanotechnology—the control of matter at the level of atoms and molecules—has evoked a large body of literature on moral and ethical issues. Almost all of this is expressed in secular voices. Religious commentaries about nanotechnology have been much more rare. And yet survey research indicates that religious belief will be one of the most powerful influences in shaping public views about nanotechnology. This paper argues that it is worth knowing what religious voices have said about nanotechnology, so that we might (...) anticipate additional religious reactions in the future. After that, this paper presents seven cases of religious reactions to nanotechnology from a variety of faiths. This information gives us some insights about how religious individuals and institutions think about this technology, and also insights about how a new technology evokes a variety of hopes and fears. (shrink)