New York State Route 123
| Smith Ridge Road | ||||
Map of Westchester County in southeastern New York with NY 123 highlighted in red | ||||
| Route information | ||||
| Maintained by NYSDOT | ||||
| Length | 4.68 mi (7.53 km) | |||
| Existed | 1930–present | |||
| Major junctions | ||||
| South end | Route 123 at the Connecticut state line | |||
| North end | NY 35 in South Salem | |||
| Location | ||||
| Country | United States | |||
| State | New York | |||
| Counties | Westchester | |||
| Highway system | ||||
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New York State Route 123 (NY 123) is a 4.68-mile (7.53 km) north–south state highway in the northern part of Westchester County, New York, in the United States. The route, named Smith Ridge Road, is a northward continuation of Route 123 from New Canaan, Connecticut.