Southport is a town in Chemung County, New York, United States. The population was 10,940 at the 2010 census. The town is located in the southwest corner of Chemung County and is southwest of the city of Elmira. It is part of the Elmira Metropolitan Statistical Area.

The area was first settled around 1788. The town of Southport was formed from the town of Elmira in 1822. In 1867, an eastern section of the town was used to form part of the new town of Ashland.

According to the United States Census Bureau, Southport has a total area of 46.8 square miles (121.3 km²), of which 46.4 square miles (120.2 km²) is land and 0.42 square miles (1.1 km²), or 0.91%, is water.

The south town line is the border of Pennsylvania, and the west town line is the border of Steuben County, New York. The Chemung River, a tributary of the Susquehanna River, forms part of the northern border.

New York State Route 14 and New York State Route 328 are north-south highways that intersect in Southport village.

As of the census of 2000, there were 11,185 people, 4,189 households, and 2,890 families residing in the town. The population density was 240.4 people per square mile (92.8/km²). There were 4,353 housing units at an average density of 93.6 per square mile (36.1/km²). The racial makeup of the town was 90.55% White, 6.78% Black or African American, 0.19% Native American, 0.23% Asian, 0.04% Pacific Islander, 1.47% from other races, and 0.75% from two or more races. Hispanic or Latino of any race were 2.91% of the population.

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