Tiergarten is a locality within the borough of Mitte, in central Berlin (Germany). Notable for the great and homonymous urban park, before German reunification, it was a part of West Berlin. Until Berlin's 2001 administrative reform, Tiergarten was also the name of a borough (Bezirk), consisting of the current locality (Ortsteil) of Tiergarten plus Hansaviertel and Moabit. A new system of road and rail tunnels runs under the park towards Berlin's main station in nearby Moabit.

Berlin is both a city and one of Germany's federated states. Since the 2001 administrative reform, it has been made up of twelve districts, each with its own administrative body. However, unlike the municipalities and counties of other German states, the Berlin districts are not territorial corporations of public law with autonomous competencies and property, but simple administrative agencies of Berlin's state and city government, the City of Berlin forming a single municipality since the Greater Berlin Act of 1920. Thus they cannot be equated to US or UK boroughs in the traditional meaning of the term.