:1942 U.S. National Championships (tennis)

{{Use mdy dates|date=July 2023}}

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

{{TennisEventInfo|1942|U.S. National Championships|

| date = August 27 – September 7

| edition = 62nd

| category = Grand Slam (ITF)

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

| venue=West Side Tennis Club

| surface = Grass

| champms={{flagicon|USA|1912}} Ted Schroeder

| champws={{flagicon|USA|1912}} Pauline Betz

| champmd={{flagicon|USA|1912}} Gardnar Mulloy / {{flagicon|USA|1912}} Bill Talbert

| champwd={{flagicon|USA|1912}} Louise Brough / {{flagicon|USA|1912}} Margaret Osborne

| champxd={{flagicon|USA|1912}} Margaret Osborne / {{flagicon|USA|1912}} Ted Schroeder

}}

The 1942 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 August 27 until September 7. It was the 62nd staging of the U.S. National Championships and due to World War II it was the only 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=73–74}}