Hong Woo-won or Hong U-won (Korean: 홍우원; Hanja: 洪宇遠; 29 July 1605 – 27 July 1687) was a Korean Neo-Confucian scholar, politician and writer, who lived during the Joseon period. He was from the Namyang Hong clan (To Hong lineage).

• Father – Hong Yeong (홍영; 洪榮; 26 July 1567 – 20 April 1624)
  • Grandfather - Hong Ga-shin (홍가신; 洪可臣; 17 July 1541 — 14 June 1615)
  • Grandmother - Lady Yi of the Jaeryeong Yi clan (정경부인 재령 이씨; 7 December 1540 — 28 March 1615)
• Mother – Lady Heo of the Yangcheon Heo clan (양천 허씨; 28 November 1569 – 1 February 1652)
  • Grandfather - Heo Seong (허성; 許筬; 13 June 1548 — ?)
  • Grandmother - Lady Yi of the Jeonju Yi clan (전주 이씨; 1550–?)^[a]; eldest daughter of Yi Heon-guk (이헌국; 李憲國; 1524–?)
• Siblings
  • Older sister - Lady Hong of the Namyang Hong clan (남양 홍씨; 1592–?)
  • Older brother - Hong Woo-jeong (홍우정; 洪宇定; 1593–1654)
  • Older brother - Hong Woo-gwan (홍우관; 洪宇寬; 1596–?)
  • Older sister - Lady Hong of the Namyang Hong clan (남양 홍씨)
  • Older brother - Hong Woo-gwing (홍우굉; 洪宇宏; 1603–?)
  • Younger brother - Hong Woo-ryang (홍우량; 洪宇亮; 1608–?)
• Wives and their issue
  • Lady Yi of the Yeonan Yi clan (연안 이씨; 1605–?)^[b]; youngest daughter of Yi Gwang-jeong (이광정; 李光庭; 1552–1629)
    • Daughter - Lady Hong of the Namyang Hong clan (남양 홍씨; 1630–?)
    • Son - Hong Myeon (홍면; 洪冕; 1635–?)
  • Lady Gwon (권씨; 1615–?)
    • Daughter - Lady Hong of the Namyang Hong clan (남양 홍씨; 1639–?)
    • Son - Hong Chim (홍침; 洪䒞; 1640–?)

• Nampamunjib (남파문집) [Vol. 13]
• Baekheuknan (백흑난)
• Mokgeunchimseol (목근침설) [essay]

• Yisanguisindobimyeong (이상의신도비명; 李尙毅神道碑銘)
• Yunseondosindobimyeong (윤선도신도비명)
• Yuseondosijang (윤선도 시장; 諡狀)
• Jeongmyojunggannamyanghongssiseboseo (정묘중간남양홍씨세보서; 丁卯重刊南陽洪氏世譜序)

• Song Si-yeol
• Yun Seon-do

• Hong Uwon:Nate (in Korean).
• Hong Uwon Archived 2017-04-18 at the Wayback Machine (in Korean).
• Hong Uwon (in Korean).
• Hong Uwon on the Encyclopedia of Korean Culture (in Korean).