Ópusztaszer (till 1974 Sövényháza) is a village in Csongrád county, in the Southern Great Plain region of southern Hungary.
It covers an area of 59.5 km2 (23 sq mi) and has a population of 2290 people (2001).
Coordinates: 46°29′N 20°05′E / 46.483, 20.083