New York State Route 438 (NY 438) is a north–south state highway located entirely in Erie County, New York, in the United States. Though signed as north–south, the route runs in an almost east–west direction for between Gowanda and Irving through the Cattaraugus Indian Reservation. The southern terminus of the route is at an intersection with U.S. Route 62 (US 62) and NY 39 in Gowanda. Its northern terminus is at a junction with US 20 and NY 5 in Irving. The route was assigned in the mid-1940s. Although it is signed as a state route, the state does not maintain any of the route.