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Look up Harnish in Wiktionary, the free dictionary.
Harnish is a surname. Notable people with the surname include:
- Chandler Harnish (born 1988), American football quarterback
- Reno L. Harnish (born 1949), American diplomat
- Rick Harnish, American non-profit executive
- Verne Harnish (born 1954), American businessman