Sierra Marjory Boggess is an American theater actress, singer, and figure skater.
She is best known for originating the role of Ariel in The Little Mermaid on Broadway, and for her multiple appearances as Christine Daaé in The Phantom of the Opera. She first appeared in the Las Vegas production of Phantom in 2006. In 2010, she reprised the role of Christine in the original London version of Love Never Dies, which continues the story of Phantom. In 2012, she played Fantine in the London production of Les Misérables. She then played Christine in the Broadway production of The Phantom of the Opera in 2013. She also originated the role of Rosalie Mullins in School of Rock in 2016.