New York State Route 118 (NY 118) is a north–south state highway that extends for 10.71 miles (17.24 km) in Downstate New York in the United States. Much of the highway is located within Westchester County; however, a small portion of the route near the northern terminus is situated in Putnam County. The southern terminus of the route is at an intersection with NY 100 in the town of Yorktown. Its northern terminus is at a junction with U.S. Route 6 (US 6) in the hamlet of Baldwin Place. NY 118 passes through the hamlets of Yorktown Heights and Amawalk, where it overlaps with US 202 and NY 35. The route was assigned as part of the 1930 renumbering of state highways in New York; however, it was initially routed on the portion of modern NY 100 and US 202 between the New Croton Reservoir and Croton Falls. It was moved onto its current alignment to Croton Lake in the late 1930s, but the easternmost piece was designated as an extension of NY 129 to a traffic circle in the hamlet of Pines Bridge. This section became a piece of NY 118 by 1969.

New York State Route 100 (NY 100) is a major north–south state highway in Westchester County, New York, in the United States. It begins parallel to Interstate 87 (I-87) at a junction with the Cross County Parkway in the city of Yonkers and runs through most of the length of the county up to U.S. Route 202 (US 202) in the town of Somers. NY 100 was designated as part of the 1930 renumbering of state highways in New York. Prior to becoming a state road, various sections of NY 100 were part of several important early roads in the county.