Bezirk Hartberg is a former district of the state of Styria in Austria.

Hartberg merged with the district of Fürstenfeld to form the new district Hartberg-Fürstenfeld on January 1, 2013.

Towns (Städte) are indicated in boldface; market towns (Marktgemeinden) in italics; suburbs, hamlets and other subdivisions of a municipality are indicated in small characters.