This book summarizes what is known about the amphibians and reptiles found in the state of Nuevo León, Mexico. It includes a brief introduction, a summary of the previous herpetological studies carried out in Nuevo León, a description of the physiographic characteristics of the state, a summary of the conservation status of each of the amphibian and reptile species occurring in the state, a list of the amphibian and reptile species known to occur in Nuevo León, and detailed accounts of each species. The list includes a total of 146 species: 26 amphibians (22 anurans, 4 salamanders), and 120 reptiles (49 lizards, 63 snakes, and eight turtles). This information is presented in 370 pages which include: 260 colour photos, five identification keys, 98 black and white figures, 83 colour maps, a list of localities of collections for each species, and three appendices. Amphibians & Reptiles of Nuevo León was written by Drs. Julio A. Lemos-Espinal (Universidad Nacional Autónoma de México), Geoffrey R. Smith (Denison University, Granville, Ohio), and Alexander Cruz (Colorado University at Boulder, Colorado). These three authors have extensive experience studying the ecology and distribution of amphibians and reptiles of northern Mexico, and have authored or coauthored a number of papers and books on this topic.