Chauncey Delos Beadle (August 5, 1866 in St. Catharines, Ontario – 1950) was a Canadian-born botanist and horticulturist active in the southern United States. He was educated in horticulture at Ontario Agricultural College (1884) and Cornell University (1889). In 1890 the landscape architect Frederick Law Olmsted hired him to oversee the nursery at Biltmore Estate in Asheville, North Carolina on a temporary basis. Olmsted had been impressed by Beadle's "encyclopedic" knowledge of plants. Beadle ended up working at Biltmore for more than 60 years, until his death in 1950. He is best known for his horticultural work with azaleas, and described several species and varieties of plants from the southern Appalachian region. He and three friends, including his "driver and companion" Sylvester Owe