Takeshi Sakuma (佐久間健, Sakuma Takeshi, born June 17, 1981), AKA Ken the 390 (Ken za Sankyūmaru), is a Japanese hip hop and R&B singer/rapper and voice actor who is an artist of the Rhythm Zone label owned by the Avex Group.

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In 1999, Ken the 390 helped in founding the Da.Me.Records label that helped the Japanese hip hop industry to rise.^{[citation needed]}

His debut solo album, Prologue, was released in Japan on March 25, 2006.

The latest album with a title name of Fantastic World was released on October 8, 2008.