The Arboretum at Gustavus Adolphus College, also known as The Arboretum at Gustavus or colloquially as The Arb, is on the campus of Gustavus Adolphus College in Saint Peter, Minnesota, United States. It contains a number of botanical gardens and a 125 acre arboretum with its first trees planted as small seedlings in 1973 on agricultural land. The arboretum was formerly named for Carl Linnaeus, a Swedish botanist, from 1988 to 2021.