Lockerly Arboretum, Botanical garden in Milledgeville, United States.

Lockerly Arboretum is a botanical garden in Milledgeville, Georgia, laid out around the 1852 Rose Hill mansion, now called Lockerly. Its collections include azaleas, camellias, conifers, hollies, rhododendrons, viburnums, daylilies and irises, plus a greenhouse of cacti and tropical plants. The grounds began as 50 acres and grew by 200 acres donated in 1998.

The mansion at the center, originally called Rose Hill, was built in 1852 by Judge and Mrs. Daniel R. Tucker, whose friend A. J. Downing influenced the grounds. The house was listed on the National Register of Historic Places in 2017. The arboretum itself was chartered in 1965 around the house, and in 1998 Colonel Oliver N. Worley donated 200 acres that expanded the original 50-acre site.

The name Lockerly replaced Rose Hill for the 1852 Tucker mansion at the heart of the arboretum. The grounds were shaped with advice from Andrew Jackson Downing, a friend of the Tuckers and a noted American landscape designer. Today the nonprofit arboretum is free to visit every day except Sunday.

Lockerly Arboretum is at 1534 Irwinton Road in Milledgeville and admits visitors free of charge every day except Sunday. The grounds combine the original 50 acres around the mansion with 200 acres added in 1998 for environmental education, so allow time to cover both areas.

The 1998 donation by Colonel Oliver N. Worley added 200 acres to the original 50, creating the Environmental Education facility. The site's name comes from the mansion, first called Rose Hill, built in 1852 for Judge and Mrs. Daniel R. Tucker.