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.

He served as the Deputy Chief Cabinet Secretary for Political affairs from 2020 to 2021.

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