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Look up Crosthwait in Wiktionary, the free dictionary.
Crosthwait is a surname. Notable people with the surname include:
- David Crosthwait (1898–1976), African-American mechanical and electrical engineer, inventor, and writer
- Irwin Crosthwait (1914–1981), Canadian painter
- Joseph Crosthwait (1681–?), English astronomer