Bak Gyusu (박규수, 朴珪壽, 1807–1877) was a scholar-bureaucrat, a teacher, a politician and a diplomat of Joseon Dynasty Korea. He was known as a pioneer of the enlightenment group. Bak Gyusu was a grandson of Park Ji-won, the great Silhak scholar of the Joseon. nickname was Hwanjae (환재, 瓛齋), Hwanjae (환재, 桓齋) en Heonjae (헌재, 獻齋), Hwanjaegeosa (환재거사 瓛齋居士).
When Bak was 20, he became acquainted with Crown Prince Hyomyeong (1809-1830). They became close friends and discussed politics. When the crown prince died a sudden death, Bak was so shocked that he shut himself away for 20 years.
During the period of King Gojong's reign, Queen Sinjeong, who was a wife of Prince Hyomyeong, promote Bak. When the General Sherman incident occurred, Bak was the governor of Pyongan. Bak ordered the General Sherman's crew to depart from Joseon. The ship's crew ignored Bak's order and captured Yi Hyeon-ik, an adjutant of Bak. Bak rescued Yi and destroyed the General Sherman.
- Hwanjaejip(환재집 瓛齋集)
- Hwanjaejikgye(환재직계 瓛齋織啓)
- Hwanjaesyugye(환재수계 瓛齋繡啓)
- Geogajapbokgo(거가잡복고 居家雜服攷)
- Sanggodohoimunuirye(상고도회문의례 尙古圖會文儀例)
- Jangammungo(장암문고 莊菴文稿)
- Hwanjaeyugo(환재유고 瓛齋遺稿)
- 조선의 마지막 희망이었던 '효명세자' Archived 2011-07-23 at the Wayback Machine. 오마이뉴스
- 반민족문제연구소,《친일파99인》(돌베개, 1993년) 119쪽(윤해동 집필 부분)
- Kang, Jae-eun, and Suzanne Lee. (2006). The Land of Scholars: Two Thousand Years of Korean Confucianism, p. 445
- Daehwan, Noh. "The Eclectic Development of Neo-Confucianism and Statecraft from the 18th to the 19th Century," Korea Journal (Winter 2003).
- Kang, Jae-eun and Suzanne Lee. (2006). The Land of Scholars : Two Thousand Years of Korean Confucianism. Paramus, New Jersey: Homa & Sekey Books. ISBN 978-1-931-90737-8; OCLC 60931394