The University Botanical Garden at Tøyen in Oslo is Norway's oldest botanical garden, established in 1814. It is administrated by the University of Oslo.
The University of Oslo's oldest building, the Tøyen Manor which was given as a gift in 1812, is located in the garden. The garden originally covered 75,000 square metres, but has since doubled in size. The collection includes roughly 35,000 plants of about 7500 unique species.