Veterinarians are seeing more and more reptiles as they become increasingly popular pets. When taken from their natural habitat reptiles may succumb to disease that they may not otherwise be susceptible to. Disease may follow stress caused by changes in environment, poor husbandry, improper temperature, transportation, improper nutrition, or trauma. The intent of this paper is to familiarize veterinarians with three of the more common diseases seen in reptiles: pneumonia in snakes, metabolic bone disease in iguanas, and hypovitaminosis A in turtles.