Iwata (written: 岩田 lit. "rock ricefield") is a Japanese surname. Notable people with the surname include:
- Hiroshi Iwata (岩田 寛, born 1981), Japanese golfer
- Karen Iwata (born 1998), Japanese singer
- Kiyomi Iwata (born 1941), Japanese-American artist
- Manzo Iwata (1924–1993), Japanese martial artist
- Masaharu Iwata (born 1966), Japanese video game composer
- Masahiro Iwata (born 1981), Japanese football player
- Minoru Iwata (born 1983), Japanese baseball pitcher
- Mitsuo Iwata (born 1967), Japanese voice actor
- Nakayama Iwata (1895-1949), Japanese photographer
- Satoru Iwata (1959–2015), Japanese businessman
- Sayuri Iwata (born 1990), Japanese actress and J-Pop artist
- Shinji Iwata (born 1987), Japanese baseball pitcher
- Takuya Iwata (footballer, born 1983), Japanese footballer
- Takuya Iwata (footballer, born 1994), Japanese footballer
- Yasunari Iwata (岩田 康誠, born 1974), Japanese jockey
- Yasuo Iwata (1942–2009), Japanese voice actor
- Yuki Iwata (岩田 ユキ, born 1972), Japanese film director and illustrator