Pinnau is an Amt ("collective municipality") in the district of Pinneberg, in Schleswig-Holstein, Germany. The Amt Pinnau was formed in January 2007 by the merger of the Ämter Bönningstedt and Pinneberg-Land. The seat of the Amt is in Rellingen, itself not part of the Amt.

The Amt Pinnau consists of the following municipalities:

  1. Borstel-Hohenraden
  2. Ellerbek
  3. Kummerfeld
  4. Prisdorf
  5. Tangstedt

Coordinates: 53°41′N 9°50′E / 53.683°N 9.833°E / 53.683; 9.833