Nijū Mensō

Nijū Mensō (二十面相^?, "Twenty-Faced") or Kaijin Nijū Mensō (怪人二十面相^?, "Mysterious Person Twenty-Faced") is a fictional gentleman thief and master of disguise who serves as reoccurring antagonist for Kogorō Akechi in Edogawa Rampo's mystery fiction, whom he is considered the archenemy or at least most famous adversary of.

It may also refer to the following works named after the character:

• The Fiend with Twenty Faces (怪人二十面相, Kaijin Nijū Mensō^?), one of Edogawa's Boy Detectives' Club (少年探偵団, Shōnen Tantei-dan^?) series of youth-aimed novellas
• Kaijin Nijū Mensō Den (怪人二十面相・伝^?), two novels by Sō Kitamura
• Man of Many Faces (20面相におねがい!!, Nijū Mensō ni Onegai!!^?), a comic by CLAMP
• Nijū Mensō no Musume (二十面相の娘^?), a comic by Shinji Ohara and an animated series based upon it
• K-20: Legend of the Mask (K-20 怪人二十面相・伝, Kē-Tuentī: Kaijin Nijū Mensō Den^?), a film based upon the Sō Kitamura novels

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