Yukio Okamoto (Japanese: 岡本 行夫, Okamoto Yukio; 23 November 1945 – 24 April 2020) was a Japanese diplomat, diplomatic analyst, and proponent of strong economic and political Japan–United States relations. Okamoto guided Japanese and American diplomatic relations throughout the 1980s, during an era when both countries simultaneously competed for economic influence on the global stage. He served as a diplomatic advisor and analyst for several Japanese prime ministers, including Ryutaro Hashimoto from 1996 to 1998 and Junichiro Koizumi from 2003 until 2004.