Mitsuo Horiuchi (Japanese: 堀内 光雄, Hepburn: Horiuchi Mitsuo, 1 January 1930 – 16 May 2016) was a Japanese politician of the Liberal Democratic Party, a member of the House of Representatives in the Diet (national legislature). A native of Misaka, Yamanashi and graduate of Keio University, he was elected to the House of Representatives for the first time in 1976. He joined Sosuke Uno's cabinet as the Minister of Labour.

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Party political offices
Preceded by Head of Kōchikai faction
2001–2006
Succeeded by