The following highways are numbered 18F:
New York State Route 18F (NY 18F) is a 9.80-mile (15.77 km) long state highway in northwestern Niagara County, New York, in the United States. The southern terminus of the route is at an interchange with NY 104 and the Niagara Scenic Parkway just east of the village of Lewiston. The northern terminus is at an intersection with NY 18 near Four Mile Creek State Park in Porter. NY 18F parallels NY 18 for most of its alignment, taking a more westerly course than its parent. NY 18F is the only remaining suffixed route of NY 18.
