Gráinne, or Grainne, may refer to:
People Gráinne (given name), feminine given name in the Irish language
Fiction/Mythology Gráinne, a character in the Fenian Cycle of Irish mythology Finn and Gráinne, short story The Pursuit of Diarmuid and Gráinne, story from the Fenian Cycle of Irish mythology, Gráinne, a book by Keith Roberts
Ships LÉ Grainne (CM10), mine-sweeper