A randomized controlled study evaluated a brief, bystander bullying intervention for junior high school students. Students in both groups reported an increase in knowledge and confidence to act as defenders and to utilize strategies to intervene on behalf of victims of bullying. Findings suggest possible carry-over effects from the intervention group to control group. Students in the intervention group, however, reported a significantly greater ability to identify of bullying and a decrease in anxiety (p = 0.06) relative to the control group. There were no differences in reported depression between the two groups. Implications for school counselors are discussed.