:1950 U.S. National Championships (tennis)

{{Use mdy dates|date=January 2025}}

{{TennisEventInfo|1950|U.S. National Championships|

| date = 25 August – 5 September

| edition = 70th

| category = Grand Slam (ILTF)

| location = Chestnut Hill, Massachusetts
Forest Hills, Queens, New York City
United States

| venue = Longwood Cricket Club
West Side Tennis Club

| surface = Grass

| champms={{flagicon|USA}} Art Larsen{{cite web | url=https://www.atptour.com/en/scores/archive/us-open/560/1950/draws?matchtype=singles | title=1950 US Open – Men's singles draw |publisher=Association of Tennis Professionals (ATP)}}

| champws={{flagicon|USA}} Margaret Osborne duPont

| champmd={{flagicon|AUS}} John Bromwich / {{flagicon|AUS}} Frank Sedgman

| champwd={{flagicon|USA}} Louise Brough / {{flagicon|USA}} Margaret Osborne

| champxd={{flagicon|USA}} Margaret Osborne duPont / {{flagicon|AUS}} Ken McGregor

}}

The 1950 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, New York. The tournament ran from 25 August until 5 September. It was the 70th 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=92–94}} A highlight of that year's tournament was Margaret Osborne du Pont's triple crown.