Zwischbergen is a municipality in the district of Brig in the canton of Valais in Switzerland .

The village of Gondo, which is part of Zwischbergen, is located at the southern foot of the Simplon Pass on the Italian border. Although the majority language has been German for a long time, the population is partly of Italian descent. Gondo belonged to the dominion of Novara , until Boniface de Challant, the Bishop of Sion, bought the rights to the village in 1291 from Count de Castello. However, the parish of Gondo first belonged to the diocese of Sion in 1822. For much of the history of the village a school was held in the rectory, but in 1958 a schoolhouse was built.