Queen Sinjeong

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Queen Sinjeong 신정왕후 神貞王后
Queen regent of Joseon
Regency	8 December 1863 – 13 February 1873 with Grand Prince Heungseon
Predecessor	Queen Sunwon
Successor	Queen Min
Monarch	King Gojong of Joseon
Grand queen dowager of Joseon
Tenure	10 August 1857 – 17 April 1890
Predecessor	Queen Sunwon
Successor	Dynasty and title abolished
Queen dowager of Joseon
Tenure	19 November 1834 – 10 August 1857
Predecessor	Queen Sunwon
Successor	Queen Hyojeong
Crown Princess of Joseon
Tenure	11 October 1819 – 6 May 1830
Predecessor	Crown Princess Hong
Successor	Crown Princess Min
Born	9 January 1809 Ssanghojeong, Dupo, Dumobang, Hanseong, Joseon
Died	23 May 1890 (1890-05-24) (aged 81) Heungbokjeon Hall, Gyeongbok Palace, Hanseong, Joseon
Burial	Sureung
Spouse	Crown Prince Hyomyeong
Issue	Heonjong of Joseon
Posthumous name 효유헌성선경정인자혜홍덕순화문광원성숙렬명수협천융목수령희강현정휘안흠륜홍경태운창복희상의모예헌돈장계지경훈철범신정왕후
House	Pungyang Jo
Father	Jo Man-yeong
Mother	Internal Princess Consort Deokan of the Eunjin Song clan

Queen Sinjeong (Korean: 신정왕후; Hanja: 神貞王后; 9 January 1809 – 23 May 1890), of the Pungyang Jo clan, was the only wife of Crown Prince Hyomyeong and mother of Heonjong of Joseon. She was never formally a Queen but was known as Queen Dowager Jo (조대비) during the reign of her son before Cheoljong of Joseon granted her a proper title, Queen Dowager Hyoyu (효유왕대비).

After the previous king died, she was known as Grand Queen Dowager Hyoyu (효유대왕대비), and served as nominal regent during Gojong's minority, between 1864 and 1873. Although she left all de facto power to the King's father, Grand Internal Prince Heungseon, and only kept the formal title.