Queen Hyojeong (Korean: 효정왕후; 6 March 1831 – 20 December 1903) of the Namyang Hong clan, was the second wife and queen consort of King Heonjong of Joseon, the 24th monarch of the Joseon Dynasty.
As she was the king's wife, her mother was given the royal title of "Internal Princess Consort Yeonchang" (연창부부인; 延昌府夫人), and her father was given the royal title of "Internal Prince Ikpung" (익풍부원군; 益豊府院君).
The Heungseon Daewongun then approached Queen Shinjeong, Cheoljong's legal sister-in-law, as he was a distant relative of King Injo and the adoptive son of Prince Eunsin.
She was later given "Hyojeong" (효정; 孝定) for her posthumous title along with "Seong" (성; 成) added to it.
Her tomb, Gyeongneung, is located in Donggureung, in the city of Guri, Gyeonggi Province, and is buried with her husband, Heonjong, and his first wife, Queen Hyohyeon.