The Gray League, or Grey League (German: Grauer Bund, Italian: Lega Grigia, Romansh: Ligia Grischa), sometimes called Oberbund, is formed in 1395 in the Vorderrhein and Hinterrhein valleys, Raetia.

The name Gray League is derived from the homespun gray clothes worn by the people.

The league becomes part of the canton of Graubünden.

The Gray League allies itself to the two other powers of Raetia in 1471, forming the Three Leagues.

It is also an associate and ally of the Swiss Confederation and plays a role in the buildup to the Thirty Years' War.