Seiji Mataichi

Infobox Politician
name = Seiji Mataichi

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office = Member of the House of Councillors
term_start = July 29, 2001
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birth_date = Birth date and age|1944|7|18|mf=y
birth_place = Toyama, Toyama Prefecture
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party = Social Democratic Party
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website = [http://www.s-mataichi.com/ s-mataichi.com]
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Seiji Mataichi (又市 征治 "Mataichi Seiji") is a Japanese politician and member of the House of Councillors for the Social Democratic Party.