Polygala smallii is a rare species of flowering plant in the milkwort family known by the common name tiny polygala, or tiny milkwort. It is endemic to Florida in the United States, where it is limited to the southeastern coast of the peninsula. The plant is now only known from eight sites, with most individuals located on one site in Miami-Dade County. The species is threatened by the loss of its habitat. This is a federally listed endangered species of the United States.