Muay Thai Wettkampf- und Verbandsmanagement

Muay Thai or Muaythai (Thai: มวยไทย, RTGS: muai thai, pronounced [mūaj tʰāj] ), sometimes referred to as Thai boxing, the Art of Eight Limbs or the Science of Eight Limbs, is a Thai martial art and full-contact combat sport that uses stand-up striking, sweeps, and various clinching techniques. The name "Art of Eight Limbs" refers to the combined use of fists, elbows, knees and shins. Muay Thai became widespread internationally in the late 20th to 21st century, when Westernised practitioners from Thailand began competing in kickboxing and mixed-rules matches as well as matches under Muay Thai rules around the world. The professional league is governed by the Professional Boxing Association of Thailand, sanctioned by the Sports Authority of Thailand.

Muay Thai is related to other martial art styles of the Indian cultural sphere such as Musti-yuddha, Muay Chaiya, Muay Boran, Muay Lao, Lethwei, Kun Khmer, Benjang and Tomoi. A practitioner of Muay Thai is known as a Nak Muay. Western practitioners in Thailand are sometimes called Nak Muay Farang, meaning "foreign boxer".

The term Muay Thai is a Thai term that is a compound word made up of two basic words; muay and Thai.

The term muay is derived from the Sanskrit root word mavya, which means "to pull together," "to form into a single group or unit," or "unity." It is defined as "to tie" and "sport boxing" in Thai. The alternative form of the Sanskrit word mavya is mavy (mavyati), (Sanskrit: मव्य् (मव्यति), lit. 'to bind, to tie, to fasten.') from its root term mav. (Sanskrit: मव)

The term Thai comes from the word Tai, means "free" and "Tai-Kadai speakers."

The term Muay Thai is successor of the term Ram Mut Ram Muay (Thai: รำหมัดรำมวย) since the reign of King Rama II (1809–1824), and has thus entered into the global vocabulary.

The oldest text of the term Muay ever recorded is found in the palm-leaf manuscripts in Northern Thai language called Mungrai Law 1839 BE, enacted 1296 AD. The pronunciation of the word Muay existed in Thai people since prior Nanzhao period (738–902 AD) said in The History of Muay Thai by The Institute of the Art of Muay Thai, Department of Physical Education National Stadium of Thailand (DPE).

The historical term Tha Nai Lueak (Thai: ทนายเลือก, Thai pronunciation: [tʰá naːj lɯ̂ːak]), meaning "Nak Muay for the King's guard, the name of division to be in charge of Nak Muay." The term was adopted in the Law of the Military and Provincial Hierarchy 1998 BE since 1455, during the reign of King Borommatrailokkanat, and repealed during the reign (1851–1868) of King Mongkut.

The term Muay Thai is also written in various languages, including Polish: boks tajski, Dutch: thai boxing, Finnish: thainyrkkeily, Russian: муай - тай, Korean: 무에타이, Japanese: ムエタイ, and Chinese: 泰拳.

The earliest origin of Muay Thai dates back to the 657 AD Haripuñjaya period of a hermit named Sukatanata who established his school of liberal and martial arts consisting of Muay Thai, which will be mentioned in order of history compiled officially by The Institute of the Art of Muay Thai, Department of Physical Education National Stadium of Thailand (DPE).

From 738 AD in the Nanzhao period. Muay Thai had been trained from variant movements of dance; Fon jerng or jerng means "tactics" or "finesse", (Thai: ฟ้อนเจิง) included weapons and bare hands, showing the art of men's fighting, which is similar to Lei tai due to the war engagement with China for a long time. It is said to be the earliest stage of Thai people forming, and Muay Thai had been training for generations along the Fon jerng dance. The Fon jerng also became one of the recreational Thai classical dances in Northern Thailand, existing nowadays.

After the Northern Thai people, led by King Lavachakkaraj, who ruled the town of Fang (Thai: เมืองฝาง) (now Uttaradit province, Thailand), founded the Singhanavati Kingdom, known as Yonoknakhon (757–1188), they continued to expand their territory by seizing and establishing kingdoms, such as the Lan Na Kingdom, Phayao Kingdom, Haripuñjaya, and Lampang.

From 947 AD onward, they conquered various ethnic groups, including the Khom ethnic groups, aboriginal Siamese (known as Siam-asli, Saimi-mandala, Siamese Lavo, Xiān, or Siam at that time), and Mon-Khmer in the upper part of the Chao Phraya River basin, using their martial arts skills (Muay). The Tai people then moved down northwest and successfully established the Sukhothai Kingdom (1238–1438) under the rule of King Si Inthrathit, who was a descendant of King Phrom, a descendant of the Singhanavati Dynasty (King Lavachakkaraj). This is mentioned in the folklore, the Legend of Singhanavati.

The Mungrai Customary Law 1296 CE (Mungraiyashastra), one of the oldest palm-leaf manuscripts written in the Northern Thai language during the reign of King Mangrai, who established the town of Chiang Mai (1292–1311), also mentioned the Tai martial arts (Muay) in section 7, under the article of 18 types of quarrels, for the first time in the Lan Na Kingdom. In the folklore, the Legend of the Phayao Kingdom (1094–1338), the version by Wat Sriboonrueng mentioned the Tai martial arts (Muay) known as jerng tiw khui during the reign of King Chueang Maharat (1115–1162).

During the Pre-Ayutthaya era (Ayodhya period) before 1351, the Royal Chronicle of the North documented King Uthong's importation of Muay boxers from the city of Sri Phalo (now Chonburi province, Thailand) to the city-state of Ayodhya. This occurred during his reign from 1253 to 1289, and a Muay boxing match between a Siamese boxer and a Chinese boxer also took place during the late reign of King Suwanracha, who ruled Ayodhya from 1301 to 1310. Furthermore, the Siam-Thai of Ayutthaya (known as Gywan and Siam-Asli) launched an attack on the Thaton kingdom in 1056 CE. They expanded their territory southward and used their martial arts skills (Muay) to penetrate deep into the Malay Peninsula before 1160 CE. These events are recorded in various historical