Basher Kill is a stream in Orange and Sullivan counties in the U.S. state of New York. It is a tributary to the Neversink River. The stream headwaters are at 41°35′10″N 74°27′58″W / 41.58611°N 74.46611°W and elevation of approximately 540 feet in Sullivan County just north of Wurtsboro and connected to the Delaware and Hudson Canal. The stream flows to the southwest paralleling U.S. Route 209 passing under New York Route 17 southeast of Wurtzboro. The stream enters Orange County at the village of Westbrookville. The stream continues to the southwest crossing under New York Route 211 to its confluence with the Neversink River at 41°26′58″N 74°35′35″W / 41.44944°N 74.59306°W at an elevation of 459 feet. The confluence is just northeast of the community of .