Zoo Basel is a non-profit zoo in the city of Basel, Switzerland. Its official name is Zoologischer Garten Basel — or in English: Basel Zoological Garden. Basel residents affectionately call it Zolli. Its main entrance is just outside Basel's downtown strip of Steinen-Vorstadt and extends in the Birsig stream valley to Basel's city border with Binningen, Basel-Country.

Basel, also known as Basle, is a city in northwestern Switzerland on the river Rhine. Basel is Switzerland's third-most-populous city, with 177,595 inhabitants within the city municipality limits. The official language of Basel is Swiss Standard German and the main spoken language is the local Basel German dialect.