Oklahoma Botanical Garden and Arboretum, Botanical garden at Oklahoma State University, United States.

The Oklahoma Botanical Garden and Arboretum is a 100-acre (40 ha) botanical garden and arboretum west of the Oklahoma State University campus in Stillwater. It holds over 1,000 species of herbaceous and woody plants, with display gardens including a water garden, rock garden, butterfly garden, wildscape garden, Japanese tea garden, and a miniature railway garden.

The arboretum was created in 1976 as a teaching, research and extension unit of Oklahoma State University's Department of Horticulture and Landscape Architecture. Its founding aims were to teach plant identification, hold species introduced by the USDA, and study plant production and the problems of establishing plants in urban settings.

The garden serves as a learning space where people explore the importance of native plants to the local environment. The design of different sections reflects the region's commitment to growing plants in ways that work with nature.

The site is open daily from sunrise to sunset with marked paths guiding you through different sections. The trails are well-marked, making it easy to explore even on your first visit.

The garden holds a century-old grove of native and introduced tree species, and its herbarium is registered with Botanic Gardens Conservation International under the code OKLA. The display areas also include a miniature railway garden.