Lillie Eginton Warren (January 25, 1859 – ?) was an American educator and an author of work upon defective speech. She was the inventor of the Warren Method of Expression Reading and Numerical Cipher. This method was a patented series of pictures of the expressions of the facial muscles produced by articulate speech by which it was possible for a deaf person to understand conversation by the eyes alone. Until the 1890s, deaf education was limited to children, but Warren and her assistant, Edward Nichie, expanded the scope of work to adults.