Donald MacNeill Fairfax | |
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| Born | August 10, 1822 Mount Eagle, Fairfax County, Virginia |
| Died | January 10, 1894 (aged 75) Hagerstown, Maryland |
| Allegiance | United States of America |
| Service/ |  United States Navy |
| Years of service | 1837–1881 |
| Rank |  Rear admiral |
| Commands | Cayuga Nantucket Montauk |
| Battles/wars | American Civil War |
Donald MacNeil Fairfax (March 10, 1818 – January 10, 1894) was an officer in the United States Navy during the American Civil War.