Conrad II of Weinsberg (German: Konrad II. von Weinsberg) (c. 1340 - 19 October 1396) was the Archbishop of Mainz from 1390 until 1396. Conrad was born into the noble family of Weinsberg. He became a cathedral member in Mainz and a scholar of the Cathedral chapter. Following the death of Adolph I of Nassau-Wiesbaden-Idstein Conrad was elected with a majority the new Archbishop of Mainz, although a significant minority voted for John of Nassau-Wiesbaden-Idstein, the brother of Adolph. Conrad was a supporter of the Antipope Clemens VII against Pope Boniface IX. Conrad formed a close relationship with Rupert II of the Electorate of the Palatinate, and together they created several peacemaking initiatives. Conrad died in Mainz in 1396 and was buried in Mainz Cathedral.