Frauenfeld (Swiss Standard German pronunciation: [ˈfraʊənˌfɛld] ; Alemannic German: Frauefäld) is the capital (German: Hauptort) of the canton of Thurgau in Switzerland. The official language of Frauenfeld is (the Swiss variety of Standard) German, but the main spoken language is the local variant of the Alemannic Swiss German dialect.

The earliest traces of human settlement are several La Tène era graves to the east of Langdorf. The Roman road from Oberwinterthur (Vitudurum) to Pfyn ran through what is now the Allmend in Frauenfeld. Two Roman villas were discovered in Thalbach and Oberkirch. The villa seems to have become the focal point of the later settlement of Oberkirch.