The Royal Botanic Society was a learned society founded in 1839. Its purpose was to promote "botany in all its branches, and its applications." Soon after it was established, it leased the grounds within the Inner Circle in Regent's Park, London for use as an experimental garden. The garden was open to members and their guests and also to the general public for a fee on certain days of the week. It included large palm-houses and a water-lily house. In the summer, flowershows, fetes, and other entertainments were held there.
In 1932 it failed to secure a renewal of the lease, and the Society was dissolved. Its surviving record were deposited in the St. Marylebone Public Library.
The site became Queen Mary's Gardens, which is run by the Royal Parks Agency, and is fully open to the general public without charge as part of Regent's Park.
The Royal Botanic Society was not related to the Royal Botanic Gardens, Kew.