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.

Preceded by:

Conrad II of Weinsberg

Succeeded by:

Adolph I of Nassau-Wiesbaden-Idstein Archbishop of Mainz
1390 - 1396
John II of Nassau-Wiesbaden-Idstein