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'', the common name of the fungus ''Aspergillus oryzae''
*Koji, an interactive content creation tool from GoMeta
See also
*Kojii, music project by Kojii Helnwein
*''Coji-Coji'' (コジコジ), an anime series sometimes romanized ''Koji Koji''
*Kōji mold Aspergillus oryzae, a fungus used in East Asian fermentation
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