New York State Route 17

New York State Route 17 (NY 17) is a major state highway that extends for 397 miles (638.91 km) through the Southern Tier and Downstate regions of New York in the United States. It begins at the Pennsylvania state line in Mina and runs east as a limited-access highway, following the Southern Tier Expressway to Binghamton and the Quickway from Binghamton east to Woodbury. At Woodbury, the route turns south to become a local arterial, eventually following the Orange Turnpike to the New Jersey state line near Suffern. The portion of NY 17 west of Woodbury is in the process of being upgraded to Interstate 86, and as of February 2025, the routes are concurrent from the Pennsylvania border to Vestal and from Kirkwood to Windsor.

At 397 miles (639 km), NY 17 is the longest state route in New York, and is the second-longest highway of any kind in the state, behind only the New York State Thruway. It serves 11 counties, passes through the cities of Salamanca, Olean, Corning, Elmira, and Binghamton, and enters the vicinity of several others, including Jamestown and Middletown. As it proceeds across the state, it intersects many of New York's major Interstate and U.S. Highways, including U.S. Route 219 (US 219) in Salamanca, I-390 in Avoca, I-99 and US 15 near Corning, I-81 and US 11 in Binghamton, I-84 and US 6 near Middletown, and I-87 in Woodbury. Aside from a brief concurrency with the Thruway near Hillburn, the route is maintained by the New York State Department of Transportation, including a portion in the vicinity of Waverly that is physically located in Pennsylvania.

Initially part of an auto trail called the Liberty Highway, the route was added to the state highway system in 1924, extending from Westfield to Suffern via at-grade highways. As traffic demand surged, it was moved onto the Quickway and the Southern Tier Expressway as limited-access sections of both were completed from the 1950s to the 1990s. In 1998, all of NY 17 between the Pennsylvania state line and Woodbury was designated as "Future I-86". The westernmost 177 miles (285 km) of the route was designated as I-86 one year later, and the designation has been gradually extended eastward as sections of NY 17 were improved to Interstate Highway standards. Prior to the I-86 designation, NY 17 was part of a multi-state Route 17 along with New Jersey Route 17 and the former Pennsylvania Route 17.