| Queen Mundeok 문덕왕후 | |
| Succession: | Princess of Goryeo |
| Reign: | ?–? |
| Predecessor: | Lady Bohwa |
| Regent: | Wang So, King Gwangjong |
| Reg-Type: | Monarch |
| Succession1: | Queen consort of Goryeo |
| Reign1: | 981–? |
| Reign-Type1: | Tenure |
| Coronation1: | 981 |
| Predecessor1: | Queen Heonae |
| Successor1: | Queen Seonjeong |
| Father: | Gwangjong of Goryeo |
| Mother: | Queen Daemok |
| Spouse: | Wang Gyu, Prince Hongdeok Seongjong of Goryeo (m. 981) |
| Issue: | Queen Seonjeong (with Wang Gyu) |
| Birth Date: | 955 |
| Birth Place: | Goryeo |
| Death Date: | before 997 |
| Death Place: | Goryeo |
| Posthumous Name: | Queen Hyogong Sunseong Yeongyong Sukjeol Wonheon Seonwi Mundeok 효공순성영용숙절원헌선위문덕왕후 (孝恭順聖英容肅節元獻宣威文德王后) |
| Religion: | Buddhism |
Queen Mundeok of the Chungju Yu clan (; 955–?) was a Goryeo princess as the youngest daughter and child of King Gwangjong and Queen Daemok, also the youngest sister of King Gyeongjong.[1]
The future Queen was born in 955 as the youngest child of King Gwangjong and Queen Daemok. Although she was recognized as being part of the royal Wang clan, she was put under her paternal grandmother’s clan, the Chungju Yu clan.
She firstly married Wang Gyu, who was also the grandson of Lady Heondok and King Taejo, the only son of Crown Prince Sumyeong. They had a daughter together who would eventually marry King Mokjong, the son of King Gyeongjong.
But after Wang Gyu’s death, Lady Yu remarried again and became a queen consort through her marriage with her half first cousin, King Seongjong, as his first and primary wife. From this marriage, Queen Mundeok became the fifth reigned Goryeo queen who followed her maternal clan after Queen Heonjeong, her half first cousin and the first Goryeo queen who remarried.
Her death date is unknown, but seeing that her son-in-law (biologically, her nephew), King Mokjong gave her posthumous names in 997, it seemed that she died sometime before that.