Toshio Yamauchi (山内 俊夫, Yamauchi Toshio, born December 17, 1946) is a Japanese former politician of the Liberal Democratic Party, a member of the House of Councillors in the Diet (national legislature). A native of Marugame, Kagawa and graduate of Waseda University, he was elected to the House of Councillors for the first time in 1998 after serving in the assembly of Kagawa Prefecture since 1991.