The mass media are rife with violent images and messages and youth spend a great deal of time with media. A rich tradition of research shows that exposure to media violence leads to aggressive thoughts, emotions, and behavior, and also to fear and desensitization. Certain youth are more vulnerable to violent media messages and images; the impact of media violence is modified by its nature and context. Parents, teachers, and the media industry should work toward mitigating the effects of media violence on youth; pediatricians and other health care providers play a key role in fostering healthy family media habits.