Lee Wan-yong, also spelled Yi Wan-yong or Ye Wan-yong, was a Korean politician who served as the 7th Prime Minister of Korea. He was pro-Japanese and is best remembered for signing the Japan–Korea Annexation Treaty, which placed Korea under Japanese rule in 1910.

The Japan–Korea Treaty of 1910, also known as the Japan–Korea Annexation Treaty, was made by representatives of the Empire of Japan and the Korean Empire on 22 August 1910. In this treaty, Japan formally annexed Korea following the Japan–Korea Treaty of 1905 and the Japan–Korea Treaty of 1907.