Peavy Arboretum, Research arboretum in Corvallis, Oregon.

Peavy Arboretum is a forest collection dedicated to studying and displaying diverse tree species within McDonald State Forest. Three interconnected trails wind through the property, allowing visitors to move between different forested zones and specimen plantings.

Oregon State University founded this arboretum in the 1920s to support research and forest education. A federal work program camp operated here during the 1930s and early 1940s, contributing labor and expertise to develop the grounds and build facilities.

The arboretum is named for George W. Peavy (1869–1951), who headed the forestry department of what was then Oregon Agricultural College when the grounds were founded. Its woody plants, both native and exotic, are mapped and clearly labeled, so students and visitors can read each specimen's identity along the paths.

The grounds are open to the public with no entrance fee, and visitors can walk the trails any time during daylight hours. The paths remain passable throughout the year and are clearly marked, making navigation straightforward for people of different abilities.

The arboretum is named for George W. Peavy (1869–1951), who headed the forestry department at what was then Oregon Agricultural College when the grounds were founded. The 40-acre site on Arboretum Road is open daily without charge.