Manabu Sakai (坂井 学, Sakai Manabu, born September 4, 1965) is a Japanese politician of the Liberal Democratic Party, a member of the House of Representatives in the Diet (national legislature). A native of Fuchū, Tokyo and graduate of the University of Tokyo, he was elected for the first time in 2005. As of 2021, he is the Deputy Chief Cabinet Secretary.[1]