He's Just Not That Into You is a self-improvement book written by Greg Behrendt and Liz Tuccillo that was published in 2004 and later adapted into a film by the same name in 2009. It was a New York Times bestseller and was featured on The Oprah Winfrey Show. The book is a "self-help" guide aimed for single women. The premise of the book, as stated in the title, tells women readers that if a man in whom you are interested is not making the effort to pursue you, he is simply "just not that into you."

ISBN: 9780689874741