Park Mun-su (October 28, 1691–1756), also known as Bak Munsu, was a Korean government official in the period of King Yeongjo in the Joseon period. He was famous for the lifetime he spent protecting the Korean people from corrupt royal officials. Park passed the state examination in 1723 and later became a secret royal inspector (Amhaengeosa; 暗行御史, 암행어사). He is the most famous secret inspector in the history of Korea, and has become something of a legendary figure, with many legends surrounding his achievements. Bak was the son of Park Hang-han, and a member of the Goryeong Park clan. His art name was Gieun, his courtesy name was Seongbo, and his posthumous name was Chungheon. Two portraits of Park Mun-su have been preserved and are in good condition.

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