The Boy Next Door is a 2015 American psychological thriller film directed by Rob Cohen and written by Barbara Curry. The film stars Jennifer Lopez, Ryan Guzman, and Ian Nelson, with John Corbett and Kristin Chenoweth playing supporting roles. The film follows a 19-year-old boy who, after having a one-night stand with his high school teacher, develops a dangerous and deranged obsession with her.

Barbara Curry, a former criminal lawyer, wrote the screenplay for the film inspired from her life's experiences. Blumhouse Productions financed and produced the film, which was filmed for 23 days in Los Angeles and other locations in California at the end of 2013.

The film was released in the United States on January 23, 2015, by Universal Pictures. The Boy Next Door received generally negative reviews from film critics, who felt that it promised "campy thrills" but did not deliver; however, the film grossed $53.4 million against a $4 million budget, making it a box office success. It was released on Blu-ray and DVD on April 28, 2015.