|1933 U.S. National Championships|
|Date||2 September - 10 September (M)|
14 August - 19 August (W)
|Category||Grand Slam (ITF)|
|Surface||Grass / Outdoor|
|Location||Forest Hills, Queens|
New York, United States
|Venue||West Side Tennis Club|
|George Lott / Lester Stoefen|
|Betty Nuthall / Freda James|
|Elizabeth Ryan / Ellsworth Vines|
The 1933 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 2 September through 10 September for the men's tournament and 14 August through 19 August for the women's tournament. It was the 53rd staging of the U.S. National Championships and the fourth Grand Slam tennis event of the year.
Earlier in the year Jack Crawford had won the Australian Championships, French Championships and Wimbledon but his defeat in the final against Fred Perry meant he did not become the first tennis player to win the Grand Slam. This honor would go to Don Budge who won all four Grand Slam tournaments in 1937.