People with the last name Niwa in Massachusetts
- Akari Niwa
- David Niwa
- Edward Niwa
- Estuko Niwa
- Gary Niwa
- Grace Niwa
- Junya Niwa
- Kosuke Niwa
- Linda Niwa
- M Niwa
- Masako Niwa
- Masanori Niwa
- Mifumi Niwa
- Mitsuru Niwa
- Mitz Niwa
- Osamu Niwa
- Paul Niwa
- S Niwa
- Sae Niwa
- Sumiyo Niwa
- Tomohiko Niwa
- Tomohiro Niwa
- Yasuharu Niwa
- Yasuhito Niwa
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