Mary Watson Whitney | |
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| Born | September 11, 1847 Waltham, Massachusetts, U.S. |
| Died | January 21, 1921 (aged 73) Waltham, Massachusetts, U.S. |
| Alma mater | Vassar College |
| Scientific career | |
| Fields | Astronomy |
| Institutions | Vassar Observatory |
Mary Watson Whitney (September 11, 1847 – January 20, 1921) was an American astronomer and was the head of the Vassar College Observatory for 22 years, where 102 scientific papers were published under her guidance.