Baden, sometimes unofficially, to distinguish it from other Badens, called Baden bei Zürich or Baden im Aargau, is a town and a municipality in Switzerland. It is the main town or seat of the district of Baden in the canton of Aargau. Located 25 km (16 mi) northwest of Zürich in the Limmat Valley mainly on the western side of the river Limmat, its mineral hot springs have been famed since at least the Roman era. Its official language is German, but the main spoken language is the local Alemannic Swiss-German dialect. As of 2018 the town had a population of over 19,000.

The County of Baden was a condominium of the Old Swiss Confederacy and is now part of the Swiss canton of Aargau. The county was established in 1415 after the Swiss conquest of the Aargau and was ruled as a shared condominium until 1798 when it became part of the short-lived Canton of Baden.