Gonario II (also spelled Gonnario and Gunnari; died between 1180 and 1190) was the giudice of the Sardinian kingdom of Logudoro[b] from the death of his father in 1128 until his own abdication in 1154.

When the Athen family tried to harm the young ruler, Ittocorre whisked him away to Porto Torres and the protection of the Pisans, who took him to Pisa and the house of Ugo da Parlascio Ebriaco.

At this time, Comita II of Arborea allied with the Republic of Genoa to defend himself from filopisano[d] Logudoro, thus dividing the island's allegiance.

On 26 June 1132, Comita I of Gallura paid homage to Roger at Ardara, thus preliminarily establishing the legatine status of Gonario's principality.

The Pisan prelate, travelling the island as a papal legate, had excommunicated the judge for oppressing the people and warring against Pisa, his rightful sovereign.

Bernard of Clairvaux even weighed into island politics and sent a letter to Pope Eugene III to justify Baldwin's actions and commend Gonario as quia bonus princeps dicitur.