The present book entitled Breeding of Horticultural Crops: Principles and Practices, Section I is ventured with the objective to provide latest possible information’s on fundamentals of breeding of horticultural crop including Centre of origin, mode of reproduction, Breeding system, Breeding methods, Breeding for Pest and Disease Resistance, and Intellectual property rights. Section II including Cytotaxonomy and Breeding Behaviour of Fruit Crops i.e., Mango, guava, citrus, papaya, pineapple, pomegranate, and temperate fruits. Section III refers to breeding behaviour of vegetable crops i.e. tomato, brinjal, chilli, cole crops, okra, pea, and cucurbit crops. Section IV includes vegetable seed production technology i.e. seed production techniques, development of seeds, seed production of vegetable crops, and hybrid seed production.