| 1918 U.S. National Championships | |
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| Date | 26 August – 3 September (M) 17 June – 22 June (W) |
| Edition | 38th |
| Category | Grand Slam (ITF) |
| Surface | Grass |
| Location |
Forest Hills, Queens New York, United States |
| Venue | West Side Tennis Club |
| Champions | |
| Men's Singles | |
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| Women's Singles | |
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| Men's Doubles | |
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| Women's Doubles | |
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| Mixed Doubles | |
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The 1918 U.S. National Championships (now known as the US Open) was a tennis tournament that took place on the outdoor grass courts at the West Side Tennis Club, Forest Hills in New York, United States. The tournament ran from 26 August until 3 September. It was the 38th staging of the U.S. National Championships and due to World War I the only Grand Slam tennis event of the year.
Robert Lindley Murray defeated
Bill Tilden 6–3, 6–1, 7–5
Molla Bjurstedt defeated
Eleanor Goss 6–4, 6–3