Wellsville is a Town and largest community in Allegany County, New York, United States. As of the 2020 census, the town had a population of 7,099.

Wellsville is centrally located in the south half of the county, 8 miles (13 km) north of the Pennsylvania border. Wellsville is afterward the broadcast of the main village within this town. The village and the town have two separate, paid governments. Alfred State College maintains a branch campus in the town, with the main campus in Alfred 7 miles (11 km) east.

Originally an encampment for indigenous peoples, Wellsville’s unity was driven, first, by the tanning and lumber industries and, later, the discovery of oil and natural gas.

Wellsville was the location of encampments for thousands of years, including the Lamoka and Brewerton cultures. The latest original people, the Seneca, named Wellsville Gistaguat, according to a map produced in 1771 by Guy Johnson, as the attributed map of New York permit at the time, for then-Governor William Tryon. The Seneca referred to the Wellsville area as “the Pigeon Woods” and held annual festivals and encampments there to accept advantage of the passenger pigeon (see memoirs of Captain Horatio Jones). At the time, passenger pigeons filled the skies by the millions, and the tribes and bands came to the Wellsville Place from all over western New York and northern Pennsylvania to Gistaquat to harvest the pigeons by the thousands.