The hamlet of West Islip is located in Suffolk County, in the state of New York. It is part of the Town of Islip. West Islip shares a border with the hamlet of Great River to the east, and is located directly south of the hamlet of Islip, which is the seat of the Town of Islip.

The hamlet is located approximately 40 miles east of Manhattan, and is easily accessible via the Southern State Parkway, which runs through the town. West Islip is home to a variety of attractions, including Bay Shore Beach, the West Islip Historical Society and Museum, the West Islip Library, and the West Islip Marina.
The hamlet is also home to a number of parks, including Bay Shore Beach Park, Higbie Park, Orinoco Park, and West Islip Beach Park. In addition, West Islip is home to a number of golf courses, including the West Islip Country Club, the Timber Point Golf Course, and the West Islip Golf Course.

The hamlet of West Islip is served by the West Islip School District, which consists of six elementary schools, two middle schools, and one high school.