Cybersecurity Psychology: Human Factors reframes cybersecurity around human cognition, decision-making patterns, and behavioral vulnerabilities that determine attack success and defense effectiveness. This comprehensive resource examines how cognitive biases, psychological shortcuts, emotional responses, and ingrained habits influence security-critical choices at individual and organizational levels across global digital environments. Coverage systematically addresses social engineering tactics, phishing susceptibility, password behaviors, security awareness limitations, and insider threat dynamics rooted in psychological factors. The book explores how optimization bias, authority bias, and authority appeal underlie successful attacks despite technical defenses. Coverage spans organizations across North America, Europe, Asia, and emerging markets, illustrating psychological principles driving cybersecurity incidents. Advanced sections address designing human-centric security systems, developing effective training programs, cultivating security culture, and building organizational environments where people become security strengths rather than vulnerabilities. Coverage emphasizes psychological principles, threat modeling incorporating human factors, and evidence-based interventions. Readers develop understanding of human vulnerabilities, defense mechanisms, and organizational psychology. This volume serves security professionals, organizational leaders, educators, and technology practitioners seeking comprehensive understanding of how psychological factors reshape cybersecurity outcomes globally.