The County of Maurienne (Latin: Comitatus Maurianensis; Arpitan: Comtât de Moryèna; French: Comté de Maurienne; Italian: Contea di Moriana) was a county in the Maurienne Valley of Upper Burgundy during the Middle Ages. Its seat was Saint-Jean-de-Maurienne.
In the 6th century, King Guntram raised the church of Maurienne into an episcopal see. In 753, Grifo was defeated by the forces of Pepin the Short in the valley on his way to Italy. The county was bestowed upon Humbert the White-Handed in 1032 for his assistance in Conrad the Salian's Italian campaigns against Aribert, archbishop of Milan. He was buried in Saint-Jean's cathedral. Along with Savoy proper (Sapaudia), this formed the nucleus of the county of Savoy which developed into the kingdoms of Sardinia and Italy under Humbert's dynasty. Maurienne continued to be noted in the formal titles of the Sardinian and Italian kings. During the unification of Italy, however, the Maurienne Valley itself was ceded to Napoleon III's France, where it now forms the commune of Saint-Jean-de-Maurienne.