Radegast is a small town in the district of Anhalt-Bitterfeld in Saxony-Anhalt, Germany. It is the smallest town in Saxony-Anhalt and is located about 13 km south of the district capital of Köthen. Since 1 January 2010, it is part of the town Südliches Anhalt.

Radegast is located midway between the cities of Köthen (Anhalt), Wolfen, Bitterfeld and Dessau.

The area of Radegast borders on the national park "Cösitzer Teich" in the southeast and on the conservation park "Fuhneaue" in the south.

Radegast is situated at the margin of the Köthen culture plain. Here it ascends from the Fuhne valley, so the difference in height is about 6 metres (20 ft) on a short distance. The town is situated right in the middle of a former swampland. The upper level of this swamp has been quite fertile for a long time. The official Radegast Chronicle says, "the lower level of the soil in this area is not bad, but its value is lowered because it is too damp." The upper level to a depth of about 0.3 m (1 ft) is meadowland with a lush vegetation of grasses and swampland, which is very fertile and became very calcareous, too because of the stagnant water. This is followed by peat, which was cut for being used as peat coal in former times. The upper level is bordered by an impermeable stratum of clay. At shallow depth large boulders can be found from ice age deposits. The quality of the soil became a lot better because of its agricultural use. It offers perfect conditions for cultivating sugar beets and wheat.