Introduction: how to read and use this book; Part I. History, contexts and debates in LGBTQ psychology: 1. Introducing LGBTQ psychology; 2. Key debates and perspectives; 3. Doing LGBTQ psychological research; Part II. Understanding social marginalisation in LGBTQ lives: 4. Diversity; 5. Prejudice and discrimination; 6. Health; Part III. LGBTQ experiences across the lifespan: 7. Young people, coming out and identity development; 8. Relationships; 9. Parenting and family; 10. Ageing and old age; Conclusion: 11. The future of LGBTQ psychology; Glossary.