King Rama v11 (r. 1925-1935) pushed for codified rules for muay, and they were put into place. Thailand's first boxing ring was built in 1921 at Suan Kularp. Referees were introduced and rounds were now timed by kick. Fighters at the Lumpinee Boxing Stadium began wearing modern gloves during training and in boxing matches against foreigners. Rope-binding was still used in fights between Thais but after the occurrence of a death in the ring, it was decided that fighters should wear gloves and cotton coverlets over the feet and ankles. It was also around this time that the term muay Thai became commonly used while the older form of the style came to be known as muay boran.

With the success of muay Thai in the mixed martial arts, it has become the de facto style of choice for competitive stand-up fighters. As a result, western practitioners have incorporated much more powerful hand striking techniques from boxing although some Thai purists accuse them of diluting the art.

World MuayThai Federation is the more genuine and dedicated organization whose main goal is to promote the Art and Sport and not just to make money.

Today, there are thousands of gyms spread out across the globe.