Wang San-ak (Korean왕산악; Hanja王山岳, ?-?) was the prime minister of Goguryeo during the reign of King Yangwon (6th century AD).

Wang San-ak
Hangul
왕산악
Hanja
Revised RomanizationWang San-ak
McCune–ReischauerWang Sanak

According to the Samguk Sagi, written in 1145, the geomungo was invented by him by using the form of the ancient Chinese instrument guqin (also called chilhyeongeum, literally "seven-string zither"). After his death, the instrument was passed down to Ok Bogo, Son Myeong-deuk, Gwi Geum, An Jang, Cheong Jang, and Geuk Jong, while being widely spread over the kingdom.

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Preceded by
Eventually Chang Jo-ri
Prime Minister of Goguryeo
?–?
Succeeded by
Eventually Yeon Ja-yu