Rugby was introduced here by the Englishmen who come into the Kingdom for doing business of for teaching in government schools. The first playground was Tung Phra – meru or Sanam Luang as commonly known nowadays.

Then, in 1901, king Chulalongkorn graciously established the Royal Bangkok Sports Club intended to be the place where foreign residents could play their sports. Rugby was one of the popular sports at that time.

From 1909, Rugby was played attentively every Saturday at the club. First, the players were merely foreigners; later, the Thais who had gone to study abroad, began to join in the games. There were finally 3 teams : , and combined nationals, antesting the Hamshire Cup.

During 1929, Phra Sutaspongpisuthi (M.L.King Sutas), an English alumnus so fond of rugby, gathered his colleagues at the post a Telegraph Department to practise the game at the ground of Vachiravudh College and also recruited the senior students to join the play.

In 1938, the Siam Rugby Football Union was finally founded, the office was situated at the Royal Bangkok Sports Club, Pathumwan. Prince phitayalongkorn was the union’s first president.

In October of the following year, the union held the first cup championship match among the members. It was called the British Council Cup. The championship cup, which is still being used until the present day, was provided by His Excellency, the British Ambassador.

The tournament was very successful. There were many teams from various institutes participated in the competition. Additionally, plate championship was also organized for student teams on the same occasion. The naval school team won the trophy delivered by Luang Praditmanudham in the final round attended also by Luang Pibulsongkram, the then Rector of Chulalongkorn University, and Prince Phitayalongkorn.

The Second world war put a halt to the union’s activities. However, in 1943, the Rector of the Physical Education Department, Phraya Chindaraksa, organized the competitions instead. This time, there was a new varsity plate championship.

In 1951, His Majesty the King graciously accepted the union into the royal patronage, and the name changed to the Thai Rugby Union Under the Royal Patronage of H.M. the King.

In 1954, His Majesty the King graciously granted the royal trophy called the “Vajiralongkorn Cup” to be the award for the traditional competition between and .

Besides, the union has sent the team over to take part in the tournaments in England Rugby has then been widely played throughout the country. It is a popular game among the schools, universities, military institutes and other private societies, and extended to the international matches until today.