Poultry are kept all over the world. They are kept by commercial farmers for meat and egg production. A disease can spread rapidly among chickens because they are usually kept together in a cage or chicken house. They also share the same food and water bowls, which can spread disease and infections from sick to healthy chickens. This situation can cause disease to spread resulting a lot of damage. This book describes the diseases of poultry, their aetiology, diagnosis, treatment and control measures. The book has covered not only the diseases of infectious nature but also the metabolic and nutritional diseases. This book is an invaluable resource for the veterinary students, practicing veterinarian, poultry inspector and researchers. It will be equally useful to the disease diagnosticians, poultry consultant and poultry farmers. Ernest Gray, was a late bacteriologist with Veterinary Laboratory, Kings College, Newcastle, Orlando. He also held position of Assistant Director in the same labaratory. He was also associated with Veterinary Hygiene at , Essex Institute of Agriculture and won various awards during his decades long experience in the field of veterinary sciences.