"Peggy O'Neill" is a traditional American folk song that tells the story of a woman named Peggy who is admired for her beauty and charm. The song often highlights themes of love, longing, and the social dynamics of relationships. It has been performed by various artists and is part of the broader American folk music tradition. The song is sometimes associated with the Irish folk music scene, as it shares similarities with other traditional tunes. Its catchy melody and relatable lyrics have made it a favorite among musicians and audiences alike, contributing to its enduring popularity in folk music circles.