Radolfzell am Bodensee (German pronunciation: [ˌʁaːdɔlfˈtsɛl ʔam ˈboːdn̩zeː]) is a town in the state of Baden-Württemberg, Germany, located at the western end (Zeller Lake) of Lake Constance, approximately 18 km (11 mi) northwest of the city of Konstanz (Constance).

The town belonged to the Abbey of Reichenau, then for a long time to the House of Habsburg, and for 40 years it was a Free Imperial City.

The citizens of the nearby village of Moos make a pilgrimage to Radolfzell in picturesquely decorated boats to fulfil an ancient oath.

A notable structure in the town is the Austrian mansion in the market square, built in stages from the 17th to the 19th century, the knightly hall dating from 1626.

Radolfzell harbour is connected to Iznang, Reichenau Island and Konstanz via shipping route.