Reiki is an ancient hands-on healing art that is used today as a modern healing intervention. In modern nomenclature, Reiki is classified as an alternative, complementary, or integrative method or therapy. And along with other such therapies, it is capturing the attention of the public because of the number of people who are using alternative methods that are outside of what is considered mainstream medicine. This nomenclature is bothersome for a healing art that is thousands of years old and predates medicine, nursing, and all such healing professions. Reiki is receiving recognition, because along with all the 'alternative' methods, the present allopathic healthcare system is failing and the public to whom it serves is seeking and demanding other avenues for holistic, caring, person-centered health care. In this changing healthcare arena Reiki and other ancient healing arts are finally gaining the attention that is rightly deserved. In this article the history of Reiki, research in Reiki, Reiki case studies, the use of Reiki as a nursing intervention, and the implications for the use of Reiki in advanced practice nursing are presented. History of Reiki Reiki is a Japanese word that translates as 'God Light Energy.' Rei is directly translated as God or light. It is used to describe the whole of creation-every cell, blade of grass, stone, tree, animal, human, every planet and star. It goes further to describe the mind of God. An accurate interpretation of the word Rei could be 'All That Is,' both in thought and form. Ki is the name given to the vital energy that is used to animate and give life to this creation. Just as a model car requires batteries to make it move, so the complex creation of the universe requires a form of energy to animate it. This energy, also known as chi or prana, can be viewed as an ocean that surrounds the physical universe. It provides us with the vitality we require to maintain our health, balance, and well being on all levels-physical, emotional, mental, and spiritual (Ellis, 1999, p. 14).