Knowledge of weed biology is essential for development of both economically and environmentally acceptable weed management systems. With this background only, the book on “Weed Seed Biology” has been prepared. This book is a documentation of botany and seed biology of 42 dryland, 32 gardenland and 21 wetland weed species. The book consists of three major parts namely Part I: Seed biology of dryland weeds, Part II: Seed biology of gardenland weeds and Part III: Seed biology of wetland weeds. Each chapter deals with origin and distribution, habitat and habit, reproductive biology, flowering, pollination and fruit set, propagation and seed dispersal, lifecycle, seed dormancy and germination, and seed storage and burial. Besides, the past work done on weed Seed Science and Technology is also compiled by reviewing many literatures. It’s effects on crop production, control measures and uses are also included in each chapter. The book on “Weed Seed biology” is highly useful to the students, teachers and scientists specializing in weed seed science.