Willemijn Verkaik is a Dutch singer and actress. She is best known for her stage roles in Wicked and Elisabeth, and for providing the singing voice for Elsa in both the German and Dutch versions of Disney's Frozen. She was the longest running Elphaba in the musical Wicked, having played the role over 2,000 times, and is the only person to have played the role in three languages. Her first performance as Elphaba was on 31 October 2007, in Stuttgart, Germany, and her final performance was on 22 July 2017 in the West End of London.

Wicked is a musical with music and lyrics by Stephen Schwartz and a book by Winnie Holzman. It is a loose adaptation of the 1995 Gregory Maguire novel Wicked: The Life and Times of the Wicked Witch of the West, which is in turn based on L. Frank Baum's 1900 novel The Wonderful Wizard of Oz and its 1939 Metro-Goldwyn-Mayer film adaptation.