Borrell I (Spanish: Borrell I de Pallars) was the sovereign Count of Pallars in 948–995.
Count Borrell was a son of the Count Lope I of Pallars and Goltregoda of Cerdanya.
Until at least 953, he was a minor under the regency of his mother. Borrell ruled Pallars together with his brothers, Raymond II of Pallars and Suñer I.
He was married to Lady Ermentruda.