1926 U.S. National Championships (tennis)

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

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

{{TennisEventInfo|1926|U.S. National Championships|

| date =September 13–18 (M)
August 16–23 (W)

| edition = 46th

| category = Grand Slam (ITF)

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

| venue=West Side Tennis Club

| surface = Grass

| champms={{flagicon|FRA}} René Lacoste{{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=454–483}}

| champws={{flagicon|USA|1912}} Molla Bjurstedt Mallory

| champmd={{flagicon|USA|1912}} Richard Norris Williams / {{flagicon|USA|1912}} Vincent RichardsCollins, p. 477

| champwd={{flagicon|USA|1912}} Elizabeth Ryan / {{flagicon|USA|1912}} Eleanor GossCollins, p. 479

| champxd={{flagicon|USA|1912}} Elizabeth Ryan / {{flagicon|FRA}} Jean BorotraCollins, p. 482

}}

The 1926 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 women's tournament was held from August 16 until August 23 while the men's tournament ran from September 13 until September 18. It was the 46th staging of the U.S. National Championships and the fourth Grand Slam tennis event of the year.