| 1917 U.S. National Championships | |
|---|---|
| Date | August 20 – 25 (M) June 18 – 23 (W) |
| Edition | 37th |
| Category | Grand Slam (ITF) |
| Surface | Grass |
| Location | Forest Hills, Queens New York City, U.S. (M) Chestnut Hill, PA, U.S. (W) |
| Venue | West Side Tennis Club (M) Philadelphia Cricket Club (W) |
| Champions | |
| Men's singles | |
 Robert Lindley Murray[1] | |
| Women's singles | |
 Molla Bjurstedt[2] | |
| Men's doubles | |
| Fred Alexander / Harold Throckmorton[3] | |
| Women's doubles | |
| Molla Bjurstedt / Eleonora Sears[4] | |
| Mixed doubles | |
| Molla Bjurstedt / Irving Wright[5] | |
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The 1917 U.S. National Championships (now known as the US Open), officially renamed that year to National Patriotic Tournament, was a tennis tournament that took place on the outdoor grass courts at the West Side Tennis Club, Forest Hills in New York City, United States. The tournament ran from August 20 until August 25. It was the 37th staging of the U.S. National Championships and due to World War I the only Grand Slam tennis event of the year.