Spring Valley is a village in the town of Ramapo and Clarkstown in Rockland County, New York, United States. It is located north of Chestnut Ridge, east of Airmont and Monsey, south of Hillcrest, and west of Nanuet. The population was 33,066 at the 2020 census, making it the second most populous community in both Clarkstown and Rockland County, after New City.

Spring Valley spans the border of two towns, occupying an eastern portion of the town of Ramapo and a small western portion of the town of Clarkstown. The village is next to the New York State Thruway (Interstate 87) and is served by a New Jersey Transit train station at the terminus of the Pascack Valley Line.

Spring Valley is 22 miles (35 km) north of Manhattan and 5 miles (8 km) north of the New Jersey border.

Before the opening of the railroad, there were no homes in Spring Valley.

In 1842, the New York & Erie Railroad called this part of the territory "Pascack", after a stream by the same name. The residents of the area decided to call the place Spring Valley – one certain large spring in the Valley Pond being responsible for the name. Before naming the territory Spring Valley, it was called Scotland, named after their homeland, by Scotsmen who had settled in the area.

In 1885, E. P. Lespenasse, of Spring Valley, walked from Haverstraw, New York to Washington, D.C. to settle an election bet. He carried a live pig and a rooster on his month-long journey. Lespenasse sold over 600 copies of picture post cards of himself and the animals he carried before the start of his walk and along the way as souvenirs and to support his journey.

In 1914, President Theodore Roosevelt, visited Spring Valley to discuss the political issues of the day, speaking at Lyceum.

On July 21, 1919, the Valley Theatre was first opened.