Breitenthal is a municipality in the district of Günzburg, in the German state of Bavaria. It lies in the Swabian region of the state, within the administrative area known as Mittelschwaben.
One of the notable features of the municipality is the Oberrieder Weiher, a lake that serves as a popular greenbelt recreation area for the surrounding region. The lake and its surroundings are located within Breitenthal's municipal area.
Beyond its status as a municipality in the Günzburg district and the presence of the Oberrieder Weiher, few further details are recorded in the available source material.