Rajasak Sor.Vorapin (Thai: ราชศักดิ์ ส.วรพิน; born February 23, 1967) is a retired Muay Thai fighter.

Rajasak started fighting in Muay Thai at the age of 14. He was trained by his father at his home in the Buriram province and was competing in the neighbouring provinces of Surin, Ubon Ratchathani and Korat. In 1987 he moved to Bangkok to join the Sor.Vorapin Gym.^[1]

In 1989 he defeated Ekaphon Chuwattana to capture the Rajadamnern stadium 115 lbs title. Later the same year he was matched with Langsuan Panyuthaphum in a fight billed as a champion against champion matchup. He was defeated by decision but won the rematch less than a month later.^[2]

Rajasak became a successful fighter of the Bangkok circuit with his heavy knee style, he mostly fought for the promotor Klaew Thanikhul. During his career he won the Rajadamnern Sadium belt at three different weights and defeated notable fighters of his era such as Langsuan Panyuthaphum, Jaroenthong Kiatbanchong, Therdkiat Sitthepitak, Robert Kaennorasing or Chamuekpet Hapalang.^[3]

After his fighting career Rajsak became a trainer, first at his old camp the Sor Vorapin and later in various camps, among them the Emerald Gym, Petchprasit Gym, Jitti gym, Phetsithong and 7MuayThai Gym.

• Rajadamnern Stadium
  • Rajadamnern Stadium Fighter of the Year
  • 1989 Rajadamnern Stadium 115 lbs Champion
  • 1990 Rajadamnern Stadium 122 lbs Champion (One defense)
  • 1991 Rajadamnern Stadium 126 lbs Champion