Keiko Niwa
- Place of birth: Hyogo, Japan
- Also know as: Kaori Nakamura
Keiko Niwa (丹羽 圭子, Niwa Keiko) is a Japanese editor and screenwriter born in Hyogo prefecture. She sometimes uses the name of Kaori Nakamura (中村 香, Nakamura Kaori) as her pseudonym.
