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 City, United States. The tournament ran from September 2 through September 10 for the men's tournament and August 14 through August 19 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.[1]