Mercury is a concern for fish, wildlife, and human health because of its toxicity and tendency to bioaccumulate and biomagnify in food webs. Turtles are potentially excellent model organisms for contaminant studies because of their unique ecological and life-history attributes, which include their wide geographic distribution, variation in habitat types, and range of trophic levels in which they feed. In addition, turtles are long-lived, allowing for long-term exposure to contaminants. Turtles often reach higher biomasses in an ecosystem compared with endotherms that occupy similar trophic levels. Moreover, their eggs and young are often important prey for other organisms. Yet, compared to birds and mammals, turtles have received little attention in terms of mercury contamination.