Nannen Arboretum in Ellicottville, New York, is a nonprofit public arboretum and botanical garden occupying eight acres of green space within the village. Organized in 1976, it grew into a collection of more than 250 species of trees, shrubs, flowers, and herbs. Its features include several Japanese gardens, a fish pond, a large herb garden, and nature walks. Before 2013, it was affiliated with the Cornell Cooperative Extension, and in that year it was transferred to the Town of Ellicottville, continuing its role as a public garden and local horticultural resource.