The Old Botanical Garden is a botanical garden and arboretum in the Swiss city of Zürich. The garden is, among the neighbored Schanzengraben moat and the Bauschänzli bastion, one of the last remains of the Baroque fortifications of Zürich, that was begun in 1642.

A botanical garden or botanic garden is a garden with a documented collection of living plants for the purpose of scientific research, conservation, display, and education. It is their mandate as a botanical garden that plants are labelled with their botanical names. It may contain specialist plant collections such as cacti and other succulent plants, herb gardens, plants from particular parts of the world, and so on; there may be glasshouses or shadehouses, again with special collections such as tropical plants, alpine plants, or other exotic plants that don't grow natively within that region.