The City of Berlin joined Solidarity Cities as from January 2019. In its letter announcing the decision, the Governing Mayor of Berlin, Mr Michael Müller, explained that Berlin is an "open and outward-looking metropolis that has always identified itself with the fundamental idea of solidarity". Policymakers, civil society, and many volunteers in Berlin have been committed to refugee policies based on solidarity for many years now. "We would like to continue this successful work going forward and build on what we have achieved so far. As a result, we want to express our explicit support for the commitment shown by all of the cities that have joined Solidarity Cities."

Mr Michael Müller further said: “We worked with Berlin’s civil society to draft and adopt an overall plan for integration and participation. This strategy paper lays out refugee policy priorities for the work to be done in the coming years and adheres to the principle of ‘Integration from day one.’  With many different measures and projects, we support decent accommodation for refugees, children getting settled into school quickly, training options or university enrollment for young people, finding jobs, and German language classes for all of the newcomers. It’s also important to us that refugees are able to get involved in neighborhood projects or play sports and experience German culture with Berliners.”