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Iwatani (written: 岩谷), is a Japanese surname. Notable people with the surname include:
- Mayu Iwatani (岩谷 麻由, born 1993), Japanese professional wrestler
- Tokiko Iwatani (岩谷 時子, 1916–2013), Japanese lyricist, poet and translator
- Toru Iwatani (岩谷 徹, born 1955), Japanese video game designer
- Toshio Iwatani (岩谷 俊夫, 1925–1970), Japanese footballer
- Naoji Iwatani, Japanese businessman, founder of Iwatani