Noboru Yamaguchi (山口 登, Yamaguchi Noboru, Japanese: [jamaɡɯt͡ɕi noboɾɯ]) was the second kumicho, or Godfather, of the Yamaguchi-gumi yakuza gang in Japan.

[1] He assumed control of the gang in 1925 from his father, the gang's founder, Harukichi Yamaguchi.

[2] He ruled until 1942, and was succeeded in 1946 by his protégé, Kazuo Taoka.

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