:1933 U.S. National Championships (tennis)

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{{Use American English|date=July 2023}}

{{TennisEventInfo|1933|U.S. National Championships|

| date =September 2–10 (M)
August 14–19 (W)

| edition = 53rd

| category = Grand Slam (ITF)

| location = Forest Hills, Queens
New York City, New York

| venue=West Side Tennis Club

| surface = Grass / Outdoor

| champms={{flagicon|GBR}} Fred Perry

| champws={{flagicon|USA|1912}} Helen Jacobs

| champmd={{flagicon|USA|1912}} George Lott / {{flagicon|USA|1912}} Lester Stoefen

| champwd={{flagicon|GBR}} Betty Nuthall / {{flagicon|GBR}} Freda James

| champxd={{flagicon|USA|1912}} Elizabeth Ryan / {{flagicon|USA|1912}} 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 City. 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.{{cite book|last=Collins|first=Bud|title=The Bud Collins History of Tennis|year=2010|publisher=New Chapter Press|location=[New York]|isbn=978-0942257700|edition=2nd|pages=49–51}}

Earlier in the year Jack Crawford had won the Australian Championships, the French Championships and the Wimbledon but his defeat in the finals against Fred Perry did not let him become the first tennis player to win the Grand Slam.{{cite book|last=Quist|first=Adrian|title=Tennis : The Greats, 1920-1960|date=1984|publisher=ABC Enterprises and William Collins|location=Sydney|isbn=9780642527202|oclc=50097790|page=50}} This honor would go to Don Budge who won all four Grand Slam tournaments in 1938.

Helen Wills Moody's retirement in the finals to Helen Jacobs was her first loss at a Grand Slam tournament since Kitty McKane defeated her in the final of the 1924 Wimbledon Championships.