WENDLER TREMML is a member of organizations including the following:
- Foreign Trade Association of North Rhine-Westphalia (AHV NRW)
- Federal Association for IT, Telecommunications and New Media (BITKOM)
- German Solar Industry Association (BSW)
- Federal Association for Economic Development and Foreign Trade (BWA)
- IT Working Group of the German Law Society (DAV IT)
- German-American Chamber of Commerce
- German-British Chamber of Industry and Commerce
- German-Polish Chamber of Industry and Commerce
- German Association for Law and Information Technology (DGRI)
- Geneva Group International, international network of independent law firms (GGI)
- German Association for the Protection of Intellectual Property (GRUR)
- Japanese Chamber of Industry and Commerce in Berlin
- Association of IT Organizations in Berlin and Brandenburg (SIBB)
