Synthetic pyrethroids are a class of pesticides widely used for agricultural and household purposes. The use of synthetic pyrethroids has, considerably, increased in recent years. However, the increase in synthetic pyrethroids use has subsequently raised concerns about their effect on aquatic life as they are highly toxic to aquatic invertebrates. Thus, monitoring accumulation of these compounds in the environmental matrices is of great concern. In this book the analytical methods for the analysis of pyrethroids were compared with detailed discussion about their merits and demerits. Also, factors affecting stability of synthetic pyrethroids in environmental samples were discussed. Besides, on the basis of published literature and my experience, suggestions were made concerning the optimum conditions for handling environmental samples of synthetic pyrethroids during transport and storage. Finally, I hope that this book will benefit researchers in the field of environmental analysis.