The Secret is a best-selling 2006 self-help book written by Rhonda Byrne, based on the earlier film of the same name. It is based on the superstitious law of attraction and claims that positive thinking can create life-changing results such as increased wealth, health, and happiness. The book has sold more than 19 million copies worldwide and has been translated into 46 languages but has attracted a great deal of controversy and been parodied in several TV programs.

The book is very much influenced by Wallace Wattles' 1910 book The Science of Getting Rich, which Byrne received from her daughter during a time of personal trauma in 2004. Byrne read and synthesized several classic books and the words of modern-day teachers who spoke about ancient wisdom and the ways for people to attract what they desire into their lives.