Abstract We use data on all middle and high school aged children who survived a mass shooting incident on July 22, 2011 in Utoya, Norway, to understand how such events affect survivors, their families, and their peers. Using a difference-in-differences design to compare survivors to a matched control group, we find that in the short run children who survive have substantially lower GPA (nearly 0.5 SD) and increased utilization of health care services and more mental health diagnoses. In the medium run, survivors have fewer years of schooling completed and lower labor force participation. Parents and siblings of survivors are also impacted, experiencing substantial increases in doctor visits and mental health diagnoses. However, there appear to be limited impacts on school aged peers of survivors. While this event affected the entire country, we show that survivors and their families bear significant costs despite robust social safety nets and universal access to healthcare.