Wallace Delois Wattles (1860-1911) was an American author and a pioneer success writer.

His most famous work is a 1910 book called The Science of Getting Rich in which he explains how to get rich. He personally "tested" the principles he describes in his book and they worked, as although he had lived most of his life in poverty, in his later years became rich. Other books by Wallace include A New Christ, Health Through New Thought and Fasting, The Science of Being Great, The Science of Being Well, Making of the Man Who Can and a novel, Hellfire Harrison.