This textbook represents the collective vision of the Indian Academy of Pediatrics (IAP) to strengthen subspecialty care through structured education, standardized clinical approaches, and context-specific guidance. It brings together leading experts from across the country, each contributing their knowledge, clinical experience, and academic rigor to create a resource that is both authoritative and practical. The strength of this book lies in its holistic structure. It begins with the fundamentals of immunology and pathophysiology, then progresses through diagnostics, system-wise allergic disorders, food and drug allergies, immunotherapy, preventive strategies, and future directions. The inclusion of India-specific content—such as indigenous aeroallergens, local food allergy trends, pollution-driven disease burden, and diagnostic challenges unique to resource-limited settings—ensures relevance for pediatricians practicing across varied regions of the country. Particular emphasis has been given to: • Allergy diagnostics, allergen panels, and advanced testing including oscillometry • Updated management protocols based on emerging evidence and global best practices • Preventive care, including primordial, primary, secondary, and tertiary prevention • Practical aspects of running an allergy clinic, patient education, and community awareness • Evolving therapeutic options, including biologics and personalized medicine. This book is the result of months of meticulous planning, writing, reviewing, and refinement. We are deeply indebted to all contributors—chapter authors, section editors, and reviewers—for their expertise and dedication. Their commitment to advancing pediatric allergy care is evident in every chapter.