New York State Route 238 (NY 238) is a 15.22-mile (24.49 km) state highway located in Western New York in the United States. It runs in a northwest–southeast direction roughly centered on the village of Attica. In the former direction, it connects to U.S. Route 20 (US 20) in Darien and serves as a more direct route into eastern Erie County. In the latter, it links to US 20A in Orangeville and is the most direct route between Attica and Warsaw, the county seat of Wyoming County. NY 238 was assigned in the 1930 renumbering of state highways in New York as an Orangeville–Attica highway and extended northwest to Darien by the following year.

U.S. Route 20 (US 20) is a part of the United States Numbered Highway System that runs from Newport, Oregon, to Boston, Massachusetts. In the U.S. state of New York, US 20 extends 372.32 miles (599.19 km) from the Pennsylvania state line at Ripley to the Massachusetts state line in the Berkshires. US 20 is the longest surface road in New York. It runs near the Lake Erie shore from Ripley to Buffalo and passes through the southern suburbs of Buffalo, the Finger Lakes, the glacial moraines of Central New York, and the city of Albany before crossing into Massachusetts. US 20 connects to all three major north–south Interstate Highways in Upstate New York: Interstate 390 (I-390) near Avon, I-81 south of Syracuse, and I-87 in Albany by way of NY 910F.