Oakes Ames (/eɪms/; September 26, 1874 – April 28, 1950) was an American biologist specializing in orchids. His estate is now the Borderland State Park in Massachusetts.
Ames was born into a wealthy family from North Easton, Massachusetts, the youngest son of Anna Coffin Ray and Governor Oliver Ames. At age fifteen, he collected his first orchids in Easton. He was educated at Harvard University, receiving his A.B. in Biology in 1898 and his A.M. in 1899 in Botany. He married Blanche Ames (no relation) in 1900, resulting in her married name of Blanche Ames Ames.
Ames spent his entire professional career at Harvard. As administrator, he was Assistant Director (1899–1909) and Director of the Botanic Garden (1909–1922); Curator (1923–1927), Supervisor (1927–1937), Director (1937–1945), and Associate Director of the Botanic Museum (1945–1950); Chairman of the Division of Biology (1926–1935) and Chairman of the Council of Botanical Collections and Supervisor of the Biological Laboratory, the Atkins Garden in Cuba, and the Arnold Arboretum (1927–1935). As teacher, he was an instructor in botany (1900–1910), associate professor of botany (1915–1926), professor of botany (1926–1932) and Arnold professor of botany (1932–1935). From 1935 to 1941 he was a research professor of botany. He was elected a Fellow of the American Academy of Arts and Sciences in 1911.
The Orchidaceae were little-known before Ames' study and classification. He made expeditions to Florida, the Caribbean, the Philippines, and Central and South America, with his wife Blanche Ames Ames creating scientifically accurate drawings of the plants they cataloged. The Ames' work was published in the seven-volume Orchidicae: Illustrations and Studies of the Family Orchidicae. They also developed the Ames Charts, illustrating the phylogenetic relationships of the major useful plants, which are still used.