The Wolf, is a mammal of the order Carnivora. The gray wolf is the largest member of the family Canidae and also the most well known of wolves.

Though once abundant over much of North America and Eurasia, the gray wolf inhabits a very small portion of its former range because of widespread destruction of its habitat; in some regions it is endangered or threatened. Considered as a whole, however, the gray wolf is regarded as of least concern for extinction according to the International Union for the Conservation of Nature and Natural Resources. Wolves are still hunted in many areas for sport or as perceived threats to livestock. Kazakhstan is currently thought to have the largest wolf population of any nation; it has as many as 90,000, versus some 60,000 for Canada.

Wolves play an important role as apex predators in the ecosystems they typically occupy. Gray wolves have been known to thrive in temperate forests, deserts, mountains, tundra, taiga, and grasslands; this diversity reflects the wolf's adaptability as a species.

Wolves feature in folklore and mythology of cultures ancient to modern across the northern hemisphere; from the Norse legend of the giant Fenris to more sympathetic depictions in Central Asia and the suckling of Romulus and Remus in the foundation of Rome. More familiar still are the fairy tales where the wolf appears as a villain such as Little Red Riding Hood and the Three Little Pigs. Wolf legends have also given rise to the popular horror figure of the werewolf.