The Großes Walsertal (German: Großes Walsertal, Großwalsertal) is a valley located in the Austrian state of Vorarlberg . It is a side valley of the Walgau and stretches from there north to the mountainous center of the country. The end of the valley borders on the Bregenz Forest .

The name of the valley derives from the Walsers who moved there from the Valais (German: Wallis) in the 13th century (see also "Kleinwalsertal ").

The valley Großes Walsertal is located in the northern Limestone Alps between the subgroups of the Bregenz Forest mountain range (in the north) and the Lechquellen Mountains (in the south and east).

The Lutz river flows through the approximately 25 km long alpine saw-cut valley.