Navarrus of Acqs () was the bishop of Couserans from 1207 to 1216.. , gives the dates 1208–1216, while , gives 1208–1211, following , who gives a bishop named Sanche in 1213. also begins his reign in 1208.

Navarrus was a son of Raymond Arnald, viscount of Dax. He entered the Premonstratensian , where he was elected abbot. For his strong opposition to Albigensianism, he was called "the terror and the hammer of the Albigensian heretics".: . During the Albigensian Crusade, Navarrus sided with the crusaders and worked closely with the papal legates. An undated document from the archives of Jaca Cathedral names a certain Navarrus as "legate of the apostolic see".: . This legation is usually attributed to the bishop of Couserans, but, as the document is usually dated to the decade beginning in 1229, Peter Linehan regards this legation as spurious.. , accepts it.

In 1207, Navarrus, along with the legate Arnauld Amaury, received instructions from Pope Innocent III. In August or September, he attended the beween the Waldensians and the Catholics. Pierre des Vaux-de-Cernay records that Navarrus and Folquet de Marselha were the messengers sent by the papal legates to Rome to announce the deaths of the legates Diego of Osma and Raoul de Fontfroide in 1207 and the murder of legate Pierre de Castelnau in 1208. The dating of his mission is uncertain. It may have taken place as late as 1209.

In 1209, Navarrus founded the Premonstratensian . During his episcopate, the town of Saint-Lizier, which belonged to his jurisdiction, was attacked by Count . The Council of Lavaur (1213), which Navarrus may have attended, censures the count for this and other attacks on the church.

No surviving writings by Navarrus are known.

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