A free radical is an atomic or molecular species with unpaired electrons on an otherwise open shell configuration. Free Radical may also refer to:

Chemistry

* Free Radical Centre, a research center located in Australia that works in all areas of free radical chemistry * Free-radical theory of aging

Arts and entertainment

;Film * ''Free Radicals'' (1979 film), an American animated short by Len Lye * ''Free Radicals'' (2003 film) (German: '), an Austrian film by Barbara Albert ;Literature and publications * ''Free Radical'' (magazine), a New Zealand-based magazine * "Free Radicals" (short story), by Alice Munro * '' Free Radicals: The Secret Anarchy of Science'', a book by Michael Brooks ;Music * Free Radicals (band), an American band *"Free Radicals", a song by American rock band The Flaming Lips on the album '' At War with the Mystics'' ;Video games * Free Radical Design, a British video game developer {{disambiguation