Liam Mac Curtain an Dúna, also rendered as 'Uilliam MacCurtain', William Curtain, Irish Gaelic: Mac Cairteáin an-Dúna or Liam an Dúna Mac Cairteáin, French: Gulielmus Curtain (c.1668-Nov. 1724) was an Irish poet and scholar. His works remain primarily in print in the Gaelic tongue.