This book" Pharmacognosy" has written for Diploma in Pharmacy (D.Pharm) first year students strictly followed by the New syllabus provided by the Pharmacy Council of India (PCI) on 23rd September, 2021.Plants have been always used as medicine by mankind to treat health-threatening diseases and still popular to obtain new drug candidates as it is the oldest medical practice for humans. The use of botanical natural health products are on the increase all over the world. It is known that almost 80% of the populations in developing countries rely on the traditional medicine, mainly composing herbal prescriptions.In other words, pharmacognosy is described as systematic science of morphological, chemical, and biological properties along with history, cultivation, collection, extraction, isolation, bioassaying, quality control, and preparation of crude drugs of natural origin.