Bezirk Südoststeiermark (; "South East Styria") is a district of the state of Styria in Austria. It was formed on January 1, 2013 through a merger of the former Radkersburg District and Feldbach District.
Until the end of 2014 Südoststeiermark incorporated 74 municipalities. Since the 1 January Styria municipal structural reform, the district consists of 26 municipalities, since 2020 the following 25 municipalities: