Sebastian Arcelus (born November 5, 1976) is an American actor. He has made a career in theatre on Broadway, regionally, and internationally. He made his Broadway debut in Rent, first as a swing, covering the male ensemble roles as well as Mark and Roger, and then as Roger. He also starred as Jan in the original cast of the Beach Boys musical Good Vibrations.
Arcelus also played the role of Fiyero on the first national tour of Wicked from January 3 until October 3, 2006. He then reprised the role in the Broadway production of the musical from January 9 until December 16, 2007.