Trittau is an Amt ("collective municipality") in the district of Stormarn, in Schleswig-Holstein, Germany. The seat of the Amt is in Trittau.

The Amt Trittau consists of the following municipalities:

Municipality	Coat of arms	Summary
Grande		Grande is located on the river Bille and on the edge of the Sachsenwald.
Grönwohld		Grönwohld is located on the northern edge of the forest Hahnheide.
Großensee		Großensee with its location directly on the lake of the same name is a popular destination.
Hamfelde/Stormarn		Hamfelde/Stormarn is located between the forest Hahnheide and the river Bille, next to its sister municipality Hamfelde/Lauenburg.
Hohenfelde		Hohenfelde is the smallest municipality of the Amt Trittau and the district Stormarn.
Köthel/Stormarn		Köthel/Stormarn is located on the edge of the forest Hahnheide, right next to its sister municipality Köthel/Lauenburg.
Lütjensee		Lütjensee is located in the heart of the ″Stormarn Switzerland″ on the lake of the same name.
Rausdorf		Rausdorf is located on the forest ″Grander Tannen″ and the river Corbek.
Trittau		Trittau has been the center of a vast rural area for centuries.
Witzhave		Witzhave is rural, but has as the only municipality a direct highway access.

The following cities are twinned with Trittau (Amt):

• Saarijärvi, Central Finland, Finland^[2]
• Communauté de communes Sèvre et Loire, Loire-Atlantique, France^[3]
• Gmina Wieliszew, Poland^[4]
• Totton and Eling, United Kingdom^[5]