Koji, Kōji, Kohji or Kouji may refer to:
Kōji (given name), a masculine Japanese given name
Kōji (Heian period) (康治), Japanese era, 1142–1144
Kōji (Muromachi period) (弘治), Japanese era, 1555–1558
Koji orange, a Japanese citrus cultivar
Andrew Koji Shiraki (born 1987), singer/songwriter known as Koji
Koji, the software that builds RPM packages for the Fedora project
Koji (food), molds used to ferment food
Koji, an interactive content creation tool from GoMeta
