Daisy is a small unincorporated community in Atoka County, Oklahoma, United States, along State Highway 43. Located in the northeastern part of the county, Daisy was once a thriving community with a general store, school and other institutions. The post office was opened April 5, 1906. It is said to have been named for Daisy Beck, a local girl.The most famous person from Daisy is Clarence Carnes, who at 18 was the youngest inmate ever sent to Alcatraz.