| Native Name: | Bezirk Südoststeiermark |
| Native Name Lang: | de |
| Settlement Type: | District |
| Subdivision Type: | Country |
| Subdivision Name: | Austria |
| Subdivision Type1: | State |
| Subdivision Name1: | Styria |
| Subdivision Type2: | Number of municipalities |
| Subdivision Name2: | 25 |
| Established Date: | 2013-01-01 |
| Unit Pref: | Metric |
| Area Total Km2: | 983 |
| Area Note: | 2021 |
| Population Total: | 83,841 |
| Population As Of: | 1. January 2021 |
| Population Density Km2: | auto |
| Timezone1: | CET |
| Utc Offset1: | +01:00 |
| Timezone1 Dst: | CEST |
| Utc Offset1 Dst: | +02:00 |
| Area Code Type: | Telephone prefix |
| Iso Code: | AT-623 |
| Blank Name Sec1: | NUTS code |
| Blank Info Sec1: | AT224 |
Bezirk Südoststeiermark (pronounced as /de-AT/, in Germany [z-]; 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.[1]
Until the end of 2014 Südoststeiermark incorporated 74 municipalities. Since the 1 January Styria municipal structural reform, the district consists of 26 municipalities,[2] since 2020 the following 25 municipalities: