Kōzō, Kozo, Kouzou or Kohzoh (written: 浩三, 公三, 公造, 航三, 恒三, 耕三, 耕造, 幸三, 光三, 興三, 更三, 広三, 孝蔵, 皐蔵, 康三, 弘三 or 弘蔵) is a masculine Japanese given name. Notable people with the name include:

• Kozo Arai (荒井 公三, born 1950), Japanese footballer
• Kōzō Arimori (有森 浩三, born 1963), Japanese shogi player
• Kozo Haraguchi (原口 幸三, 1910–2011), Japanese sprinter
• Kozo Higuchi (樋口 浩三, born 1956), Japanese swimmer
• Kozo Hosokawa (細川 浩三, born 1971), Japanese footballer
• Kozo Igarashi (五十嵐 広三, 1926–2013), Japanese politician
• Kozo Iizuka (飯塚 幸三, born 1931), Japanese engineer
• Kozo Inoue (井上 公造, born 1956), Japanese journalist
• Kozo Kawashima (川島 弘三, born 1926), Japanese ski jumper
• Kozo Kinomoto (木之本 興三, 1949–2017), Japanese footballer
• Kozo Matsubara (松原 光三, born 1949), Japanese handball player
• Kōzō Mito (三戸 耕三, born 1979), Japanese voice actor
• Kōzō Miyoshi三好 耕三 (born 1947), Japanese photographer
• Kōzō Murashita (村下 孝蔵, 1953–1999), Japanese singer-songwriter
• Kozo Nagayama (永山 耕三, born 1956), Japanese television and film director
• Kôzô Nakamura (中村 康三), Japanese video game composer
• Kozo Ohsone (大曽根 幸三, born 1933), Japanese engineer
• Kōzō Okamoto (岡本 公三, born 1947), Japanese mass murderer
• Kozo Saeki (佐伯 幸三, 1912–1972), Japanese film director
• Kōzō Sasaki (佐々木 更三, 1900–1985), Japanese politician
• Kōzō Satō (藤 皐蔵, 1871–1948), Imperial Japanese Navy admiral
• Kōzō Shioya (塩屋 浩三, born 1955), Japanese voice actor
• Kozo Sugiyama (杉山 公造, 1945–2011), Japanese computer scientist
• Kozo Takeda (武田 幸三, born 1972), Japanese kickboxer
• Kozo Tashima (田嶋 幸三, born 1957), Japanese footballer
• Tsuboi Kōzō (坪井 航三, 1843–1898), Imperial Japanese Navy admiral
• Kozo Uno (宇野 弘蔵, 1897–1977), Japanese economist
• Kozo Watanabe (disambiguation), multiple people
• Kozo Yamamoto (山本 幸三, born 1948), Japanese politician
• Kozo Yuki (結城 耕造, born 1979), Japanese footballer