This report describes principals' reports of the frequency with which cyberbullying occurred among U.S. students in 2010 and 2016. Additionally, this report examines schools with more frequent reports of cyberbullying and compares groups of schools with varying racial/ethnic compositions and rules prohibiting cell phone use during school hours. The data for this report are from the 2010 and 2016 School Survey on Crime and Safety (SSOCS), which asked public school principals about the prevalence of violence and crime in their schools, school security measures, disciplinary problems and actions, presence of security staff, and other related characteristics. The SSOCS is a nationally representative sample survey of over 3,000 public K-12 schools in the 50 states and the District of Columbia. The following questions are answered: (1) How does the frequency of principal-reported cyberbullying compare between 2010 and 2016?; and (2) How does the frequency of principal-reported cyberbullying vary by school rules on cell phone use and percent of students who are nonwhite?