Muay Thai (Thai: มวยไทย, RTGS: Muai Thai, IPA: [muɛ̄j tʰɑ̄j], lit. Thai Boxing) is a form of hard martial art practiced in large parts of the world, including Thailand and other Southeast Asian countries. The art is similar to others in Southeast Asia such as: pradal serey in Cambodia, lethwei in Myanmar, tomoi in Malaysia and Lao boxing in Laos. Muay Thai has a long history in Thailand and is the country's national sport. Traditional Muay Thai practiced today varies significantly from the ancient art muay boran and uses kicks and punches in a ring with gloves similar to those used in Western boxing.

Muay Thai is referred to as "The Art of Eight Limbs", as the hands, shins, elbows, and knees are all used extensively in this art. A practitioner of Muay Thai ("nak muay") thus has the ability to execute strikes using eight "points of contact," as opposed to "two points" (fists) in Western boxing and "four points" (fists, feet) used in the primarily sport-oriented forms of martial arts.