The 1915 U.S. National Championships (now known as the US Open) took place on the outdoor grass courts at the West Side Tennis Club, Forest Hills in New York City, United States.

It was the 35th staging of the U.S. National Championships, the first held at Forest Hills and the second Grand Slam tennis event of the year.

[5][6] In 1915 the national championship was relocated from Newport, Rhode Island to the West Side Tennis Club at Forest Hills, New York.

[7] In early 1915 the issue resurfaced when a group of about 100 tennis players signed a petition in favor of the move, arguing that most tennis clubs, players and fans were located in the New York area and that it would therefore be beneficial for the development of the sport to host the national championship there.

[9][10] The contentious issue was brought to a vote at the annual United States National Lawn Tennis Association (USNLTA) meeting on February 5, 1915 and with 128 votes in favor and 119 against it was decided to relocate to Forest Hills.