Reindeer, with seven subspecies, number approximately 4 million and have a circum-polar distribution. They serve as sources of meat and materials for different peoples and are an important part of the arctic and subarctic ecosystems. This edited book offers a comprehensive overview of health and diseases in reindeer and caribou and represents an important tool for veterinarians and biologists to understand and manage these vast animal populations. The book also will be relevant to researchers dealing with wildlife diseases.