The 1975 US Open was a tennis tournament that took place on the outdoor clay courts at the West Side Tennis Club in Forest Hills, Queens, in New York City, United States.

It was the 95th staging of the US Open, and the fourth Grand Slam tennis event of 1975.

During the final three years at the Forest Hills location, 1975-1977, the US Open was played on a green-colored Har-Tru clay surface, a surface slightly harder and faster than red clay.

The switch came after player complaints about the poor state and uneven ball bounce on the grass courts in Forest Hills.

[1] The tie-break scoring system changed in this championship.