Anselm Casimir Wambold von Umstadt (30 November 1582 – 9 October 1647) was a German theologian who served as Archbishop and Elector of Mainz from 1629 until his death in 1647.

In June 1608, Archbishop of Mainz Johann Schweikhard von Kronberg named him a member of his Hofrat, becoming its president in January 1609, a position he held until 1618.

With the Thirty Years War raging, on Christmas 1631, forces under Gustavus Adolphus of Sweden occupied Mainz, though the archbishop had already fled to Cologne.

An ardent supporter of the Catholic position during the Thirty Years War, his intransigence was partially responsible for delaying the signing of the Peace of Westphalia until after his death.

After concluding a peace with the French, Anselm Casimir Wambold von Umstadt died in Frankfurt on 9 October 1647.