This report provides a review of evidence about what works in preventing homophobic, biphobic and transphobic (HBT) bullying in schools. This evidence review: - examines existing research about effective initiatives and interventions to prevent HBT bullying in schools, - is conducted by NatCen Social Research, - represents the first stage in the ‘Tackling homophobic, biphobic and transphobic bullying among school-age children and young people’ study.