The Battle of Riade or Battle of Merseburg is fought between the troops of East Francia under King Henry I and the Magyars at an unidentified location in northern Thuringia along the river Unstrut on March 15, 933.

The battle had been precipitated by the decision of the Synod of Erfurt to stop paying an annual tribute to the Magyars in 932.

Recorded by the Saxon chronicler Widukind of Corvey, it is a morale-boosting victory for the East Franks.