Lyuh Woon-hyung or Yo Un-hyung (May 25, 1886 – July 19, 1947) was a Korean politician who argued that Korean independence was essential to world peace, and a reunification activist who struggled for the independent reunification of Korea following its national division in 1945.

His pen-name was Mongyang (몽양; 夢陽), the Hanja for "dream" and "the sun." He is rare among politicians in modern Korean history in that he is revered in both South and North Korea.