Yukio Hatoyama is a Japanese politician who served as Prime Minister of Japan and Leader of the Democratic Party of Japan from 2009 to 2010. He was the first Prime Minister from the modern Democratic Party of Japan. Hatoyama is currently the founder and leader of Kyowa Party, a minor political party established in 2020 after he announced his return to politics.

Haruko Hatoyama was a Japanese educator of the Meiji, Taishō and Shōwa periods, and the matriarchal head of the prominent Japanese Hatoyama political family which has been called "Japan's Kennedy family." She was a co-founder of what is today Kyoritsu Women's University. Her husband was politician Kazuo Hatoyama.