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| Natisone | |
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| Origin | Punta di Montemaggiore, Julian Prealps |
| Mouth | Torre River |
| Basin countries | Italy |
| Length | 50 |
| Source elevation | 415 m |
| Basin area | 322 km² |
The Natisone (Latin: Natiso; Friulian: Nadison; Slovenian: Nadiža) is a river of Eastern Friuli, in north-eastern Italy. It is the main tributary of the Torre and a sub-affluent of the Isonzo.
The Natisone is formed at 415 m above sea level on the border between Friuli and Slovenia by the confluence of two streams: the Rio Bianco (Slovenian: Bela Nadiža) and the Rio Nero (Slovenian: Črni Patok) which spring from the Punta di Montemaggiore and Gabrovig mountains. Before the confluence with the Torre, it passes through the communes of Pulfero and Cividale del Friuli.
