New York State Route 25B (NY 25B) is a east–west state highway located on Long Island in New York, United States. The western terminus of the route is at an intersection with NY 25 in Queens. The eastern terminus is at an interchange with NY 25 in Westbury, Nassau County. NY 25B is named Hillside Avenue for its entire length, except for a brief portion in the village of East Williston, where it is called East Williston Avenue.