The Lechtal is an alpine valley in Austria, the greater part of which belongs to the state of Tyrol and the smaller part to Vorarlberg . The Lech river flows through the valley.

The valley is bounded geographically by the Lechtal Alps in the south and the Allgäu Alps in the north. The upper Lech valley, with its settlements of Zürs am Arlberg and Lech in Vorarlberg, is a well-known ski region, whilst the rest of the valley is rather less well developed for tourism. There are industrial and trading estates, especially in the Reutte Basin.

Several side valleys branch off the Lechtal including, on the left-hand side, the Hornbachtal and the Tannheimer Tal .