Juan (or John) de Urtubia (spelled Durthubie or Durthubia in the Pamplonese archives and de Ortobia or Ortubia in the Barcelonan archives of the Crown of Aragon; sometimes called Joan de Urtúvia in Catalan; died 1381) is a Navarrese royal squire (escudero del Rey in contemporary documents) who leads first a contingent of fifty men-at-arms on an expedition to recover the Kingdom of Albania (1376–1377) and later a large army against Thebes and Boeotia, which he conquers in 1379.