Ryuzo Sasaki (笹木 竜三, Sasaki Ryūzō, 27 November 1956 – 28 June 2022) was a Japanese politician of the Democratic Party of Japan, a member of the House of Representatives in the Diet (national legislature). A native of Fukui, Sasaki attended Waseda University as both undergraduate and graduate. He was elected to the House of Representatives for the first time in 1993 as an independent after running unsuccessfully in 1990.