The Whiteboys () were a secret Irish agrarian organization in 18th-century Ireland which used violent tactics to defend tenant farmer land rights for subsistence farming. Their name derives from the white smocks the members wore in their nightly raids, but the Whiteboys were usually referred to at the time as Levellers by the authorities, and by themselves as "Queen Sive Oultagh's children", "fairies", or as followers of "Johanna Meskill" or "Sheila Meskill", all symbolic figures supposed to lead the movement.