Gail (Slovene: Zilja, Italian: Zeglia) is the name of a river in southern Austria, the largest right tributary of the Drava.

[2] The name Gail developed from Old High German Gîla, in turn from the form *Gīla (which was also the source of the Slovene name Zilja).

The river source is located east of the Kartitsch Saddle and the Puster Valley in the Tyrolean municipality of Obertilliach.

The river reaches the state of Carinthia in Lesachtal and from Kötschach-Mauthen runs down the broader Gail Valley (German: Gailtal) with its steep slopes, parallel to the borders with Italy and Slovenia.

Following the 1348 Friuli earthquake, the river's course near Villach was buried by a major landslide, causing extensive flooding.