Motonari Iguchi 井口 基成 (Iguchi Motonari) (17 May 1908, in Tokyo – 29 September 1983, in Tokyo) was a Japanese pianist and educator.

He was influential in the post-war Japanese classical music world and his editions, published by Shunjūsha, are still the standard ones in that country.

At the Tokyo Academy of Music Iguchi was a student of Leonid Kreuzer, a German piano instructor known for his powerful playing style, which Iguchi adopted.

Later, Motonari Iguchi and his wife, Aiko, went on to become professors at the Tokyo Academy of Music.

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