This work seeks to answer a number of fundamental questions about religious experiences. It thus addresses issues such as what it is that makes such experiences ‘religious,’ whether some religious experiences are more ‘authentic’ than others and whether these experiences provide insights into otherwise inaccessible regions of reality or are products of the brains of those who have them. The author draws upon a number of scholarly perspectives in the course of this project, primarily phenomenological, philosophical and psychological ones, though research from other academic disciplines has also been incorporated.