Hugh III (died 3 March 1383) was the eldest son and successor of Marianus IV of Arborea and Timbor of Rocabertí.
They had a daughter named Benedetta, who in 1373 was asked in marriage by the Louis I, Duke of Anjou, second son of King Charles V of France, without success.
[2] Hugh participated in his father's last military campaign against Pere de Luna, the Catalan general, commanding one of the battles which ambushed him in a pincer movement at Oristano in 1365.
The rebels declared a "Republic" and made the law (which Hugh and his father had done so much to codify, expand, and improve) the sovereignty in Arborea.
Hugh's successor was his nephew Frederick, under the regency of his sister Eleanor, who pacified the rebels and reinstated judicial government.