Objective To study the prospective link between involvement in bullying (bully, victim, bully/victim), and subsequent suicide ideation and suicidal/self-injurious behavior, in preadolescent children in the United Kingdom.Method 6043 children in the Avon Longitudinal Study of Parents and Children (ALSPAC) cohort were assessed to ascertain involvement in bullying between 4 and 10 years and suicide ideation at 11.7 years.