Nordstormarn is an Amt ("collective municipality") in the district of Stormarn, in Schleswig-Holstein, Germany. It is situated around Reinfeld, which is the seat of the Amt, but not part of it.
The Amt Nordstormarn consists of the following municipalities:
- Badendorf
- Barnitz
- Feldhorst
- Hamberge
- Heidekamp
- Heilshoop
- Klein Wesenberg
- Mönkhagen
- Rehhorst
- Wesenberg
- Westerau
- Zarpen
53°50′N 10°31′E / 53.833°N 10.517°E