Yuen Kay-shan (Chinese: 阮奇山; Cantonese Yale: Yún Kèih-sāan; pinyin: Ruǎn Qíshān), nicknamed Yuen Lo-jia (Chinese: 阮老揸; Cantonese Yale: Yún Lóuh Jā; pinyin: Ruǎn Lǎo Zhā) [1] was a Grandmaster of Wing Chun.

[2] [3] [4] He was the fifth child of wealthy firework monopoly owner Yuen Chong Ming, and was known as an undefeated champion of 1000 death duels during the 1920-1950s representing the Wing Chun.

[2]Wong Wah-bo and "Dai Fa Min" Kam from the Red Boat Opera Company also taught Yuen Kay-shan.

From Fok Bo-chuen, Yuen learned all the extensive open hand patterns in Wing Chun, he structured them into and created three forms, Siu Lien Tau, Chum Kiu and the Biu Jee.

Later, Ma Bok-Leung, Jiu Gan-Heung, Lo Hao-Po, Ng Ngau Si, Leung Yan as well as Yuen Kay-shan and his brother, invited Fung Siu-Ching to come and teach.

Yuen Kay-shan remained in Foshan, where he became friends with other Wing Chun notables like Ip Man, Yiu Choi, Yip Chung Hong, Lai Hip Chi, Tong Gai and others.

[9] In addition to having a high caliber skill in Wing Chun, Yuen Kay-shan had also been an educated man who had worked as a part-time lawyer.

He is also considered a major contributor to luk dim boon gwun and had at one point was even challenged by a monk from Jianxi Province.