John Selby (born 1945) is the American author of over two dozen self-help, spiritual-growth, business-success and psychology books published in 14 languages, with half a million books in print, published during the last 35 years by New World Library, Warner Books, Bantam Books, Doubleday (publisher), Dell, Random House, Harper San Francisco, Droemer Knaur Verlag, DTV Verlag, Rowohlt Verlag, and Sterling Books.