Iwasawa may refer to:
- Kenkichi Iwasawa (岩澤 健吉, 1917–1998), Japanese mathematician
- Iwasawa decomposition, a mathematical group decomposition
- Iwasawa group, a mathematical group whose subgroup lattice is modular
- Iwasawa manifold, a mathematical six-dimensional space
- Iwasawa Station, railway station
- Masami Iwasawa (岩沢 まさみ), a character from the anime, Angel Beats!
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