Major organisational disasters are not random. They are predictable. In the months and years before every catastrophic failure, before the Deepwater Horizon blowout, the Grenfell Tower fire, the Space Shuttle disasters, the Pike River explosion, the warning signs were already present. They were systematically unseen. Organisational blindness to accumulating risk is not a malfunction. In many organisations, it is the system working exactly as designed. This book explains why, and what can be done about it. The Blindspot Before the Disaster identifies the five organisational conditions that converge to produce this failure of sight: signal attenuation, normalised tolerance, structural secrecy, production gravity, and leadership detachment. Together they form the Blindspot Model, a practical diagnostic framework grounded in five decades of disaster scholarship and demonstrated across eleven of the most significant industrial catastrophes of the past forty years. This book is written for the leaders, safety professionals, and governance practitioners who are responsible for preventing harm before it occurs. It bridges the gap between rigorous academic disaster theory and the practical needs of people working in high-consequence environments. It does not assign blame. It offers something more useful: a structured, evidence-based way of seeing the danger that is already in the room.