| Ausa | |
| Source1 Location: | Novacco |
| Mouth Location: | Laguna di Marano |
| Mouth Coordinates: | 45.7528°N 13.24°W |
| Subdivision Type1: | Country |
| Subdivision Name1: | Italy |
The Ausa or Aussa (Latin: Alsa[1]) is a river in the Italian province of Udine.[2] Its source is near the city of Udine. The river flows south past Palmanova, Aiello del Friuli, Cervignano del Friuli and Terzo d'Aquileia before emptying into the Laguna di Marano between Marano Lagunare and Aquileia.[3]