Wallace Delois Wattles was an American author. A pioneer success writer, he remains personally somewhat obscure, but his writing has been widely popular in the New Thought and self-help movements.

Wattles' best known work is a 1910 book called The Science of Getting Rich in which he explained how to become wealthy. He claimed to have personally "tested" the principles he described and they apparently worked, for although he had lived most of his life in poverty, in his later years he was a prosperous man.