The Galápagos tortoise complex or Galápagos giant tortoise complex is a species complex of 15 very large tortoise species in the genus Chelonoidis. They are the largest living species of tortoise, with some modern Galápagos tortoises weighing up to 417 kg.

Galápagos tortoises are herbivores that eat prickly pear cactus (a favorite) and fruits, as well as flowers, leaves, and grasses. In fact, these tortoises can go without eating or drinking for up to a year, because they can store food and water so well.