Albert Spear Hitchcock (September 4, 1865 — December 16, 1935) was an important American botanist and agrostologist.
Hitchcock graduated from the Iowa Agricultural College with bachelor's degree in 1884 and M.S. in 1886. From 1892 to 1901 he was a professor of botany at the Kansas Agricultural College. Hitchcock joined the USDA in 1901 as Assistant Agrostologist under Frank Lamson-Scribner. In 1905 he was put in charge of the grass herbarium and became Systematic Agrostologist. After 1928, he held the title of Principal Biologist in charge of Systematic Agrostology of the Department of Agriculture and kept that title until his death in 1935. In 1912 he became Custodian of Grasses, Division of Plants, United States National Museum. Hitchcock remained Custodian without remuneration until his death. His field notebooks are archived in the Smithsonian Institution. He was a professor of botany in the Kansas State Agricultural College and authored over 250 works during his lifetime.
The Hitchcock-Chase Collection consists of 2,707 drawings (mostly ink, but some pencil) of grasses, representing hundreds of genera, that were assembled by the Smithsonian Institution agrostologists Albert Spear Hitchcock (1865–1935) and Mary Agnes Chase (1869–1963). The collection is on indefinite loan to Hunt Institute from the Smithsonian.