A lynx (plural lynx or lynxes) is any of the four species within the Lynx genus of medium-sized wild cats, which includes the bobcat. The name "lynx" originated in Middle English via Latin from the Greek word λύγξ, derived from the Indo-European root leuk- ("light, brightness") in reference to the luminescence of its reflective eyes.

The genus Lynx includes neither the caracal nor the jungle cat, sometimes called the desert lynx and the jungle lynx respectively.

Lynx have a short tail, characteristic tufts of black hair on the tips of their ears, large, padded paws for walking on snow and long whiskers on the face. Under their neck, they have a ruff which has black bars resembling a bow tie although this is often not visible.

Body colour varies from medium brown to goldish to beige-white, and is occasionally marked with dark brown spots, especially on the limbs. All species of lynx have white fur on their chests, bellies and on the insides of their legs, fur which is an extension of the chest and belly fur. The lynx's colouring, fur length and paw size vary according to the climate in their range. In the Southwestern United States, they are short-haired, dark in colour and their paws are smaller and less padded. As climates get colder and more northerly, lynx have progressively thicker fur, lighter colour, and their paws are larger and more padded to adapt to the snow. Their paws may be larger than a human hand or foot.

The smallest species are the bobcat and the Canada lynx, while the largest is the Eurasian lynx, with considerable variations within species.more