Kouichi Oohori (大堀 こういち, Ōhori Kōichi, born April 5, 1963, in Miyagi Prefecture, Japan) is a Japanese actor. He participated in Gekidan Kenko (now Nylon 100°C) from 1985 to 1992.

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Since his debut Oohori expanded his career in the stage, television, and cinema. He was part of Unit Hanakusons. Oohori also appear in stage shows with folk singer Shozo.