Chatham University Arboretum (32 acres) is an arboretum located on the campus of Chatham University at Woodland Road, Pittsburgh, Pennsylvania, United States. It is open to the public daily without charge.
The arboretum was originally Andrew Mellon's estate, with portions designed by the Olmsted Brothers, landscape architects in the 1930s. It was designated an arboretum on November 9, 1998 and now contains approximate 100 types of trees, including Japanese flowering crabapple, river birch, and Kentucky coffee tree.