Unterharz is a former Verwaltungsgemeinschaft ("collective municipality") in the district of Harz, in Saxony-Anhalt, Germany. It was situated in the eastern part of the Harz, south of Quedlinburg. The seat of the Verwaltungsgemeinschaft was in Harzgerode. It was disbanded on 1 August 2009.

The Verwaltungsgemeinschaft Unterharz consisted of the following municipalities:

  1. Dankerode
  2. Güntersberge
  3. Harzgerode
  4. Königerode
  5. Neudorf
  6. Schielo
  7. Siptenfelde
  8. Straßberg

51°39′N 11°09′E / 51.650°N 11.150°E / 51.650; 11.150