Bad Zwesten is a municipality in the Schwalm-Eder district of Hesse, Germany.

In 1992, the community was granted official recognition as a spa, allowing it to prefix the designation Bad – German for "bath" – to its name.

(as of municipal elections on 26 March 2006) The spa of Bad Zwesten bases its burgeoning prosperity on its Löwensprudel ("Lion's Fizzy Water").

About 5 km from the community is the Borken/Bad Zwesten interchange with Autobahn A 49 (Kassel – Fritzlar – Marburg).

The community belongs to the North Hesse Transport Network (Nordhessischer Verkehrsverbund) which, among other things, runs a hailed shared taxi to Borken railway station on the Main-Weser Railway.