Eleanor of Arborea or Eleanor De Serra Bas (Sardinian: Elianora de Arbarée / Elianora De Serra Bas, Italian: Eleonora d'Arborea / Eleonora De Serra Bas; 1347 – June 1404) was one of the most powerful and important, and one of the last, judges of the Judicate of Arborea in Sardinia, and Sardinia's most famous heroine. She is also known for updating of the Carta de Logu, promulgated by her father Marianus IV and revisited by her brother Hugh III.