The Siamese cat is one of the first distinctly recognized breeds of Asian cat. Derived from the landrace, one of several varieties of cat native to Thailand (formerly known as Siam), the Siamese became one of the most popular breeds in Europe and North America in the 20th century. The carefully refined modern Siamese is characterized by blue almond-shaped eyes, a triangular head shape, large ears, an elongated, slender, and muscular body, and point colouration. (Aside from the colouration, it bears little resemblance to the original stock, and the more moderate, traditional or "old-style" Siamese, with a much rounder head and body, has been re-established by multiple registries as the Thai cat.) The International Cat Association describes the modern Siamese as social, intelligent, and playful into adulthood, often enjoying a game of fetch. Siamese tend to seek human interaction and also like companionship from other cats.

The Siamese (sometimes in the traditional form) is among the foundation stock of several other breeds developed by crossbreeding with other cats; some examples are the Oriental Shorthair and Colourpoint Shorthair, developed to expand the range of coat patterns; the long-haired variant most often dubbed the Himalayan; and hair-mutation breeds including the Cornish Rex, Sphynx, and Peterbald. The siamese cat comes in two distinct variations Traditional, with an apple shaped head and a slightly chubby body. Or the modern siamese wich are Skinny, have a lage head and is the more known stereotypical and iconic when you think about siamese.