Caroline Frederikke Müller née Halle also known as Caroline Walther, was a Danish and later naturalized Swedish opera singer (mezzo-soprano). She was also active as an instructor at the Royal Dramatic Training Academy. She was a member of the Royal Swedish Academy of Music and a Hovsångare.

The Royal Dramatic Training Academy, was the acting school of Sweden's national stage, the Royal Dramatic Theatre, and for many years (1787–1964) seen as the foremost theatre school and drama education for Swedish stage actors. It was established in 1787 by the theatre and art loving King Gustav III and was for many years under the protection of the Swedish royal family.