The Usa (Russian: Уса́; Komi: Усва, Usva) is a river in the northeast corner of European Russia that drains the Polar Urals southwest into the Pechora.

The Usa valley has been inhabited for 40,000 years, as evidenced by the archaeological site Mamontovaya Kurya (Russian: Мамонтовой Курьи, "the mammoth curve").

Its banks here are high and cliff-like, but further downriver they become lower, wooded and boggy, except for a section around the settlement of Adak (Russian: Адак), where the river cuts through the Chernyshov Hills.

Its largest tributaries are, from the left: Yelets, Lemva, Bolshaya Synya, Bolshoy Kochmes and Kosyu, and from the right: Vorkuta, Syoyda, Adzva and Kolva.

Within the Usa basin is the large Pechora coalfield, and in its lower parts, by the town of Usinsk, there are several big petroleum and natural gas fields.