List of Champions of the 1891 U.S. National Championships (now known as the US Open):
Oliver Campbell defeated Clarence Hobart 2-6 7-5 7-9 6-1 6-2
Mabel Cahill defeated Ellen Roosevelt 6-4, 6-1, 4-6, 6-3
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| Preceded by 1890 U.S. National Championships |
U.S. National Championships | Succeeded by 1892 U.S. National Championships |
| Preceded by 1891 Wimbledon Championships |
Grand Slams | Succeeded by 1892 Wimbledon Championships |