Buchs (German pronunciation: [bʊks] ⓘ) is a municipality in the Wahlkreis (constituency) of Werdenberg in the canton of St. Gallen in Switzerland.

The town is also home to the Hightech Campus Buchs, a center for innovation and research that fosters collaboration between academia and industry.

Buchs is first mentioned in 765 as de Pogio in the testament of the Chur bishop Tello.

Of the rest of the land, 25.1% is settled (buildings or roads) and the remainder (7.5%) is non-productive (rivers or lakes).

It is a shopping, industry and services center for the upper St. Gallen Rhine valley (German: Rheintal) as well as the capital of the Wahlkreis.

It consists of the village of Buchs and the large hamlets of Räfis and Burgerau as well as scattered settlements on the Buchserberg.

The blazon of the municipal coat of arms is Vert on a Pale Argent a[n] Altar Cloth Sable ringed and fringed Or.

Of the foreign population, (as of 2000[update]), 181 are from Germany, 412 are from Italy, 1,199 are from ex-Yugoslavia, 189 are from Austria, 168 are from Turkey, and 470 are from another country.

[9] The NTB is part of the Fachhochschule Ostschweiz, FHO which is a recognized University of Applied Sciences.

The region around Schloss Werdenberg, which is shared between Buchs and Grabs, is designated as part of the Inventory of Swiss Heritage Sites.

[13] The chemical and life science company Sigma-Aldrich was acquired by the German-based Merck Group in 2014.