The aim of this study was to examine relationships between bullying and suicidal ideation. A total of 2,464 adolescents in Norway were assessed at two time points, 1 year apart [i.e., at ages 14 (T1) and 15 (T2)], with identical questionnaires. Suicidal ideation was measured by four items including both active and passive suicidal thoughts. ANOVA and standard linear regression methods were applied. Both bullied adolescents and adolescents who were aggressive toward others had significantly higher levels of suicidal ideation (p < 0.001) at age 14 (T1) than noninvolved adolescents. In the group being bullied, girls had higher levels of suicidal ideation than boys did. This was not the case for the group of adolescents who were the aggressors. In cross-sectional multivariate analyses, both being bullied and being aggressive toward others were significant (p < 0.001) predictors of suicidal ideation at age 14 (T1), when gender, age and socioeconomic status, and depressing symptom levels were controlled for. In the controlled longitudinal multivariate analyses, being bullied (p < 0.001) at age 14 (T1) predicted suicidal ideation at age 15 (T2), while aggressiveness toward others did not. Bullied adolescents (both genders) were at risk for suicidal ideation, and having an additional risk if they were depressed.