Grand Princess Seongmok (died before 1018) or shortly-called Princess Seongmok (; "the accomplishment and solemn princess") was a Goryeo royal family member as the daughter of King Taejo's 13th son, Wang Uk.
It was said that she would often go to the temple Hyeonhwasa () to pray for her parents along with her half younger brother, Wang Sun. From this, Seongmok became the first Korean noblewoman who held the title of Janggongju (장공주, 長公主; "Grand Princess""Grand Princess" is a Royal Noble title granted to a sister or favourite daughter of a monarch's ruler.) which was later used by Yilianzhenbala and Jintong.
Although her detailed information was not recorded in Goryeosa, but in 1930 during the Japanese colonial period, her existence was made known through the Hyeonhwa Sabi (현화사비; built in 1018 (10th year reign of King Hyeonjong))Hyeonhwa Sabi described the story of Queen Sinseong () based on Samguk yusa{'}s 2nd part, vol.2, about King Gim Bu the Great (), the 56th and final ruler of Kingdom of Silla in Korean. which became the North Korean National Treasure Cultural Relic No. 151 and was discovered at Yeongchu Mountain, Pangyo-ri, Gaeseong-gun, Gyeonggi Province.
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