Yukio Ozaki (?? ??, Ozaki Yukio, born December 24, 1859 – October 6, 1954) was a Japanese politician of liberal signature, born in modern-day Sagamihara, Kanagawa.
Ozaki served in the House of Representatives of the Japanese Diet for 63 years (1890–1953).
He is still revered in Japan as the "God of constitutional politics" and the "father of the Japanese Constitution".