Bex (French: [be]; German: Beis; Arpitan: Bés) is a municipality in the canton of Vaud, Switzerland , located in the district of Aigle . It is a few kilometers south of its sister town municipality of Aigle.

Bex is first mentioned in 574 as in Baccis.

Bex is the site of a famous salt mine.

The salt deposits in Bex were the first ones discovered in Switzerland. In the 15th century, a salt source is mentioned in the area, but it was not until 1554 that a large deposit was discovered in Panex.