Roßla-Südharz was a Verwaltungsgemeinschaft ("collective municipality") in the Mansfeld-Südharz district, in Saxony-Anhalt, Germany. It was situated in the southern part of the Harz, west of Sangerhausen. The seat of the Verwaltungsgemeinschaft was in Roßla. It was disbanded on 1 January 2010.

The Verwaltungsgemeinschaft Roßla-Südharz consisted of the following municipalities:

• Bennungen
• Breitenstein
• Breitungen
• Dietersdorf
• Drebsdorf
• Hainrode
• Hayn
• Kleinleinungen
• Questenberg
• Roßla
• Rottleberode
• Schwenda
• Stolberg
• Uftrungen
• Wickerode