The Lagarina Valley (German: Lagertal, Italian: Vallagarina) is a valley in northern Italy, used to define the lower mountain course of the Adige River. It is mostly included in the province of Trentino, with the lower section being part of the province of Verona. The largest town is Rovereto.
The upper limit of the valley is generally set at the so-called "Murazzi", north to Besenello and c. 10 km south to Trento. Before the latter city is known as Val d'Adige. The lower limit is the entrance in the Padan Plain, near the Chiusa di Ceraino.
The valley is home to several forts built by the Austrian Empire in the 19th century.
In the locality Lavini di Marco, near Rovereto, are several dinosaur footprints attributed to the genera Camptosaurus and Dilophosaurus. The same locality is mentioned by Dante in his Inferno (Canto XII).